def main():
 
    denominations = [20, 10, 5, 1, .25, .10, .05, .01]
    used_denom = []
    amount_denom = []
 
    user_input = float(input('enter a dollar amount: '))
 
#Keep asking user to re-enter input until they enter a value (0-200)
    while user_input < 0 or user_input > 200:
        user_input = float(input('re-enter a dollar amount: '))
 
#Traverse the list to breakdown the user_input into denominations. 
    remainder = user_input
    for d in denominations:
        num_denom = int(remainder / d)
 
        if num_denom > 0:
 
            used_denom.append(d)
 
            amount_denom.append(num_denom)
 
#Avoid dividing by a float (prevents .01 issue from occurring)
        remainder = (remainder*100) % (d * 100) / 100
 
#Traverse the amount_denom list and print the output to be formatted a certain way. 
    for i in range(len(amount_denom)):
 
        print("{0: 2d}{1:8.2f}".format(amount_denom[i],used_denom[i]),end = "")
        print("s" if amount_denom[i] > 1 else "")
 
 
main() 

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