[python][hackerrank] Append and Delete

link : https://www.hackerrank.com/challenges/append-and-delete/problem

#!/bin/python3
from itertools import zip_longest

s = input().strip()
t = input().strip()
k = int(input().strip())
output = 0

for idx, (i,j) in enumerate(zip_longest(s, t)):
    if i is None or j is None or i != j:
        output = len(s[idx:] + t[idx:])
        break

if k >= len(s+t):
    print('Yes')
elif k >= output and (k - output) & 1 == 0:
    print('Yes')
else:
    print('No')