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