diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..9ee86e7
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,6 @@
+{
+    "[python]": {
+        "editor.defaultFormatter": "ms-python.autopep8"
+    },
+    "python.formatting.provider": "none"
+}
\ No newline at end of file
diff --git a/challenges/01-calc.py b/challenges/01-calc.py
index 87f5190..4ab3a6f 100644
--- a/challenges/01-calc.py
+++ b/challenges/01-calc.py
@@ -2,3 +2,28 @@
 # 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.
+
+
+calculation = input("What calculation would you like to do? (add, sub, mult, div): ")
+
+number1 = float(input("What is number 1? "))
+number2 = float(input("What is number 2? "))
+
+result = None
+
+if calculation == "add":
+    result = number1 + number2
+elif calculation == "sub":
+    result = number1 - number2
+elif calculation == "mult":
+    result = number1 * number2
+elif calculation == "div":
+    if number2 != 0:
+        result = number1 / number2
+    else:
+        print("Error: Cannot divide by zero.")
+else:
+    print("Invalid calculation method.")
+
+if result is not None:
+    print("Your result is", result)
diff --git a/challenges/02-reverse.py b/challenges/02-reverse.py
index 8cf2677..9a7cbb5 100644
--- a/challenges/02-reverse.py
+++ b/challenges/02-reverse.py
@@ -6,3 +6,11 @@
 # 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
+
+string = input("Enter a string: ")
+reversed_string = ""
+
+for char in string:
+    reversed_string = char + reversed_string
+
+print(reversed_string)
diff --git a/challenges/03-bank.py b/challenges/03-bank.py
index 554cb1d..76b6a45 100644
--- a/challenges/03-bank.py
+++ b/challenges/03-bank.py
@@ -1,3 +1,46 @@
 print("Welcome to Chase bank.")
-print("Have a nice day!")
 
+
+balance = 4000
+
+def check_balance():
+    print("Your current balance is")
+    print(balance)
+
+def deposit():
+    amount = float(input("How much would you like to deposit?\n"))
+    global balance
+    balance += amount
+
+def withdraw():
+    amount = float(input("How much would you like to withdraw?\n"))
+    global balance
+    if amount <= balance:
+        balance -= amount
+    else:
+        print("You are broke")
+
+print ("Your current balance is")
+print(balance)
+
+while True:
+    action = input("What would you like to do? (deposit, withdraw, check_balance)\n")
+
+    if action == "deposit":
+        deposit()
+        check_balance()
+    elif action == "withdraw":
+        withdraw()
+        check_balance()
+    elif action == "check_balance":
+        check_balance()
+    else:
+        print("Invalid action.")
+
+    done = input("Are you done?\n")
+    if done == "yes":
+        print("Thank you!")
+        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..6c80e3e 100644
--- a/challenges/04-alphabetical.py
+++ b/challenges/04-alphabetical.py
@@ -1,3 +1,11 @@
 # 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):
+    alphabetized_string = ''.join(sorted(string))
+    return alphabetized_string
+
+input_string = input("Give me a string to alphabetize:\n")
+result = alphabetize_string(input_string)
+print("Alphabetized:", result)