append and delete hackerrank solution in python
if __name__ == '__main__':
s = input().strip()
t = input().strip()
k = int(input().strip())
min_len = min(len(s), len(t))
first_different_index = min_len
for i in range(min_len):
if s[i] != t[i]:
first_different_index = i
break
necessary_operations = len(s) + len(t) - 2 * first_different_index
print("Yes" if k == necessary_operations or (k >= necessary_operations and (k - necessary_operations) % 2 == 0 ) or k >= len(s) + len(t) else "No")