# Main
names = ["Anna", "Bob", "Chris"]
display_initials(names)

def display_initials(names):
    print("Initials")
    for i in range(len(names)):
        print(names[i][0:1])

# Main
names = ["Anna", "Bob", "Chris"]
display_initials(names)

"""
Procedure: display_initials(names)
----------------------------------
This procedure takes an array of names as a parameter.

It loops through each name in the array.
The line:
    print(names[i][0:1])
means:
- First choose one string from the array with names[i].
- Then take the substring from position 0 up to position 1.
- This gives exactly the first letter of that name.
The procedure prints out the initials (first letters) of all the names.
"""
def display_initials(names):
    print("Initials")
    # loop through each position in the array
    for i in range(len(names)):
        # take the substring from character 0 up to 1 of this name
        # this gives just the first letter
        print(names[i][0:1])


"""
Main program
------------
1. Create an array of names.
2. Call the procedure display_initials(names)
   and pass the array as the parameter.
"""
# Main
names = ["Anna", "Bob", "Chris"]
display_initials(names)