# Write a function to count alphabets,digits and special charactes in a given string.
def count_alpha_dig_spl(string):
    alphabets = digits = special = 0
    for i in range(len(string)):
        if string[i].isalpha():
            alphabets = alphabets + 1
        elif string[i].isdigit():
            digits = digits + 1
        else:
            special = special + 1
    return (alphabets, digits, special)
