diff --git a/challenges/01-calc.py b/challenges/01-calc.py
index 87f5190..5f6f89f 100644
--- a/challenges/01-calc.py
+++ b/challenges/01-calc.py
@@ -2,3 +2,38 @@
 # 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.
+# Create a simple calculator that first asks the user what method they would like
+# to use (addition, subtraction, multiplication, division) and then asks the user
+# for two numbers, returning the result of the method with the two numbers. Here
+# is a sample prompt:
+
+# ```
+# What calculation would you like to do? (add, sub, mult, div)
+# add
+# What is number 1?
+# 3
+# What is number 2?
+# 6
+# Your result is 9
+
+method = input('What math do you want to do today (add, sub, mult, div)?  ')
+firstnum = int(input('What is your first number?  '))
+secondnum = int(input('What is your second number?  '))
+
+def calculator(meth, first, second):
+    if meth.lower() not in ('add', 'sub', 'mult', 'div'):
+        print('sorry, response invalid, please choose a proper method')
+    elif (meth == 'add'):
+        return first + second
+    elif (meth == 'sub'):
+        return first - second
+    elif (meth == 'mult'):
+        return first * second
+    else:
+        return first / second
+
+
+print('your result is', calculator(method, firstnum, secondnum))
+
+
+
diff --git a/challenges/02-reverse.py b/challenges/02-reverse.py
index 8cf2677..027bdd0 100644
--- a/challenges/02-reverse.py
+++ b/challenges/02-reverse.py
@@ -6,3 +6,23 @@
 # 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
+# Reverse a string manually. Don't use s[::-1] (even though that's awesome).
+# Create a new variable storing an empty string and add the letters from
+# the first string one by one. The for loop should iterate over the length
+# of the string and you should access letters individually.
+
+# Below is some sample output.
+
+# ```
+# Enter a string:
+# reverse_me
+# em_esrever
+
+
+def reverse_string(str):
+    rev_str = ''
+    for i in str:
+        rev_str = i + rev_str
+    return rev_str
+
+print(reverse_string('hello'))
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diff --git a/challenges/03-bank.py b/challenges/03-bank.py
index 554cb1d..cf69c32 100644
--- a/challenges/03-bank.py
+++ b/challenges/03-bank.py
@@ -1,3 +1,55 @@
+# Create a prompt that asks the user if they would like to display their balance,
+# withdraw or deposit. Write three methods to perform these calculations and
+# output the result to the user.
+
+# Gather user input using the `input` function. Note that input always returns
+# user input as a string. You have to manually convert it to an int or a float
+# to make it behave like number. Also, end the input prompt with a \n newline
+# character if you want the user to type in on the next line.
+
+# ```
+# age = input("How old are you?\n")
+# age = int(age)
+# ```
+
+# Here is a sample output:
+
+# ```
+# Your current balance is
+# 4000
+# What would you like to do? (deposit, withdraw, check_balance)
+# deposit
+# How much would you like to deposit?
+# 1000
+# Your current balance is 5000
+# Are you done?
+# yes
+# Thank you!
+
+
 print("Welcome to Chase bank.")
-print("Have a nice day!")
+balance = int(input('your current balance is '))
+# print('your current balance is ', balance)
+action = input('Would you like to display your balance, withdraw, or deposit (please enter - balance, withdraw, deposit)?  ')
+# firstnum = int(input('What is your first number?  '))
+# secondnum = int(input('What is your second number?  '))
+def bank_action(action):
+    if action.lower() not in ('balance', 'withdraw', 'deposit'):
+        print('sorry, response invalid, please choose a proper action')
+    elif (action == 'balance'):
+        print('your current balance is ', balance)
+        
+    elif (action == 'withdraw'):
+        how_much = int(input('how much would you like to withdraw?  '))
+        print('your current balance is ', balance - how_much) 
+        
+    else:
+        how_much = int(input('how much would you like to deposit?  '))
+        print('your current balance is ', balance + how_much) 
+        
+
+
+
+
+print("Have a nice day!", bank_action(action))
 
diff --git a/challenges/04-alphabetical.py b/challenges/04-alphabetical.py
index 5051ec4..a6bec3c 100644
--- a/challenges/04-alphabetical.py
+++ b/challenges/04-alphabetical.py
@@ -1,3 +1,26 @@
 # 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.
+
+# Create a function that takes a string and returns the string with the letters in 
+# alphabetical order (ie. `hello` becomes `ehllo`), Assume numbers and punctuation 
+# symbols will not be included in the string.
+
+# ```
+# Give me a string to alphabetize
+# supercalifragilisticexpialidocious
+# Alphabetized: aaacccdeefgiiiiiiillloopprrssstuux
+# ```
+
+alpha_string = ''
+
+def alpha_it(str):
+
+    sorted_str = sorted(str)
+    print(sorted_str)
+    alpha_string = ''.join(sorted_str)
+
+    print(alpha_string)
+
+
+alpha_it('supercalifragilisticexpialidocious')
\ No newline at end of file