def appendAndDelete(s, t, k):
    # Write your code here
    equal_first_letters = 0
    while equal_first_letters < len(s) and equal_first_letters < len(t)\
    and s[equal_first_letters] == t[equal_first_letters]:
        equal_first_letters += 1
    min_moves = len(s) - equal_first_letters + len(t) - equal_first_letters
    return 'Yes' if (k >= min_moves and (k - min_moves) % 2 == 0) or k > len(s) + len(t) else 'No'