diff --git a/challenges/01-calc.py b/challenges/01-calc.py
index 87f5190..09f7027 100644
--- a/challenges/01-calc.py
+++ b/challenges/01-calc.py
@@ -2,3 +2,33 @@
 # input() always returns a string value. If you ever want someone
 # to enter a number you have to use the `int()` function to convert
 # what they typed in to a string.
+
+
+
+# age = input("Please enter your age: ")
+# age = int(age)
+# print("In ten years, you will be", age + 10, "years old.")
+# 
+
+
+# input to allow users to enter something
+calc = input("Enter the a num operation you like to do:  (add, sub, mult, div) ")
+
+num1 = int(input("The First Number: "))
+num2 = int(input("The Second Number: "))
+
+if calc == "add":
+    result = num1 + num2
+elif calc == "sub":
+    result = num1 - num2
+elif calc == "mult":
+    result = num1 * num2
+elif calc == "div":
+    result = num1 / num2
+else:
+    print("Invalid input, please try again.")
+    exit()
+
+print("Your result is", result)
+
+
diff --git a/challenges/02-reverse.py b/challenges/02-reverse.py
index 8cf2677..02021c7 100644
--- a/challenges/02-reverse.py
+++ b/challenges/02-reverse.py
@@ -6,3 +6,20 @@
 # several ways to reverse a string, and it's a good read!
 #
 # http://www.techbeamers.com/essential-python-tips-tricks-programmers/?utm_source=mybridge&utm_medium=blog&utm_campaign=read_more#tip1
+
+
+
+#prompt the user to inter something
+string = input(" Enter the string to reverse")
+#initiliazing empty string
+reversed_string = ""
+
+for i in range(len(string)):
+    reversed_string += string[len(string)-i-1]
+# The expression 'string[len(string)-i-1]' 
+# calculates the index of the character to be added to the 
+# 'reversed_string' variable.
+
+# The loop continues until all the characters in the input string have been added to the 
+# 'reversed_string' variable.
+print(reversed_string)
diff --git a/challenges/03-bank.py b/challenges/03-bank.py
index 554cb1d..52b53d0 100644
--- a/challenges/03-bank.py
+++ b/challenges/03-bank.py
@@ -1,3 +1,82 @@
 print("Welcome to Chase bank.")
 print("Have a nice day!")
 
+balance = 4000
+
+def deposit(balance, amount):
+    return balance + amount
+
+def withdraw(balance, amount):
+    return balance - amount
+
+print("Your current balance is")
+print(balance)
+
+
+# takes input from customers
+transaction = input("What would you like to do? (deposit, withdraw, check_balance)\n")
+
+if transaction == "deposit":
+    
+    # prompts with questions in new line 
+    amount = int(input("How much would you like to deposit?\n"))
+    balance = deposit(balance, amount)
+    print("Your current balance is", balance)
+elif transaction == "withdraw":
+    amount = int(input("How much would you like to withdraw?\n"))
+    balance = withdraw(balance, amount)
+    print("Your current balance is", balance)
+elif transaction == "check_balance":
+    print("Your current balance is", balance)
+
+done = input("Are you done?\n")
+
+if done == "yes":
+    print("Thank you!")
+
+
+
+
+# from hashlib import new
+
+
+# print("Welcome to Chase bank.")
+# print("Have a nice day!")
+# session = True
+# account = 0
+
+
+# def new_operation():
+#     global session
+#     input("something else? (yes, no) \n")
+#     if (new_operation == "yes"):
+#          session = True      
+#     elif (new_operation == "no"):
+#          session = False
+        
+
+# while session == True:
+    
+#     operation = input("What would you like to do? (deposit, withdraw, check balance) \n")
+
+#     if (operation == "deposit"):
+#         num1 = input("Deposit quantity \n")
+#         num1 = int(num1)
+#         account = account + num1
+#         print(f"Your account is now  {account}")
+#         new_operation()
+
+#     elif (operation == "withdraw"):
+#         num2 = input("Withdraw quantity \n")
+#         num2 = int(num2)
+#         account = account - num2
+#         print(f"Your account is now  {account}")
+#         new_operation()
+
+#     elif (operation == "check balance"):
+#         print(f"your balance is {account} \n")
+#         new_operation()
+#         print(session)
+
+
+# print("Have a nice day!")
\ No newline at end of file
diff --git a/challenges/04-alphabetical.py b/challenges/04-alphabetical.py
index 5051ec4..585e2db 100644
--- a/challenges/04-alphabetical.py
+++ b/challenges/04-alphabetical.py
@@ -1,3 +1,41 @@
-# You'll need to use a couple of built in functions to alphabetize a string. 
-# Try to avoid looking up the exact answer and look at built in functions for
-# lists and strings instead.
+# # You'll need to use a couple of built in functions to alphabetize a string. 
+# # Try to avoid looking up the exact answer and look at built in functions for
+# # lists and strings instead.
+# def alphabetize_string(string):
+#     # convert string to a list of characters
+#     chars = list(string)
+#     # sort the list in alphabetical order
+#     chars.sort()
+#     # join the list of characters back into a string
+#     alphabetized_string = ''.join(chars)
+#     return alphabetized_string
+
+# # example usage
+# user_string = input("Give me a string to alphabetize\n")
+# result = alphabetize_string(user_string)
+# print("Alphabetized:", result)
+
+
+
+# print('Please Enter Anything  to Reverse.')
+# 00
+# string = input()
+# sorted_string = sorted(string)
+# new_string = "".join(sorted_string)
+# print(new_string)
+
+
+
+def reverse_str():
+    # Ask the user to enter a string
+    string = input("Enter a something: ")
+#   slicing method
+    reversed_str = string[::-1]
+    return reversed_str
+
+# Example usage:
+print(reverse_str())
+
+
+
+