Cipher

n, k = map(int, input().split())
s = input()
b = s[0]
for i in range(1, n):
  if i < k:
    b += str(int(s[i]) ^ int(s[i-1]))
  else:
    b += str(int(s[i]) ^ int(s[i-1]) ^ int(b[i-k]))

print(b)