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