# A program that implements a rudimentary phone catalog:
# - Asks the user to enter enter names and phone numbers.
# - Enters in a loop where the user enters a name and the
#   program looks up and prints out the corresponding phone number.


# initialize lists that will store names and phone numbers
# convention: the programmer will make sure that numbers[i] stores
# the phone number for names[i].
names = []
numbers = []

# get from the user the names and phone numbers.
while True:
    name = input("enter a name: ")
    if (name == "q") or (name == "quit"):
        break
    
    number = input("enter a phone number for " + name + ": ")

    names.append(name)
    numbers.append(number)

print()

# now, get in a loop where the user enters a name, and the computer
# looks up and prints out the corresponding phone number.
while True:
    name = input("enter a name to look up: ")
    if (name == "q") or (name == "quit"):
        break

    for i in range(0, len(names)):
        if name == names[i]:
            print("the phone number of", name, "is", numbers[i], "\n")