127. Given 2 strings and a number K, check whether they differ exactly by K characters.

Given 2 strings and a number K, check whether they differ exactly by K characters.
Input Size : |s| <= 100000(complexity O(nlogn) or O(n))
Sample Testcase :
INPUT
codekata codeguvi 4
OUTPUT
yes


n,m,k=input().split()
diff=0
for i in range(len(n)):
  if n[i]!=m[i]:
    diff+=1
if diff == int(k):
  print('yes')
else:
  print('no')