How to select starting letter in a list of letters

python

I have a list of letters. As of right now, I am able to allocate my starting point based on the index point (IE: 0 = 'A', 1 = 'B', 2 = 'C', etc).

def moving_letters():
    letters = ['A','B','C','D','E','F','G']
    *user = int(input('Enter starting index #: '))* 
    print(letters[user], letters[(user + 5) % len(letters)], letters[(user + 7) % len(letters)])


print(moving_letters())

How would I be able to select a specific letter in my list as a starting point?

Also, how would I be able to move my starting point as showed in?:

print(letters[user], letters[(user + 5) % len(letters)], 
    letters[(user + 7) % len(letters)])

You can select a slice of a list with : in the index, where you can specify start and end, if either is left empty you select everything. After you have a slice of a list selected, you can use join to make a line to print. Keep in mind the items you are joining have to be strings.

def moving_letters():
    letters = ['A','B','C','D','E','F','G']
    user = int(input('Enter starting index #: '))
    s = " ".join(letters[user:])
    print(s)

moving_letters()

Slice notation: Understanding slice notation

String join: What exactly does the .join() method do?

How to select starting letter in a list of letters

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