n, k = map(int, input().split())
s = list(input())
s[k - 1] = chr(ord(s[k - 1]) + 32)
print(''.join(s)) n, k = map(int, input().split()) n map(int, input().split()) map int input().split() ().split () input split k s = list(input()) s list(input()) list input() input s[k - 1] = chr(ord(s[k - 1]) + 32) s[k - 1] s k - 1 k 1 chr(ord(s[k - 1]) + 32) chr ord(s[k - 1]) + 32 ord(s[k - 1]) ord s[k - 1] s k - 1 k 1 32 print(''.join(s)) print ''.join(s) ''.join '' join s s = list(input()) list(input()) s k = map(int, input().split()) map(int, input().split()) k n, k = map(int, input().split()) map(int, input().split()) n
n, k = map(int, input().split())
s = list(input())
s[k - 1] = chr(ord(s[k - 1]) + 32)
print(''.join(s))