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