You are given a string S of length N consisting of `A`, `B` and `C`, and an integer K which is between 1 and N (inclusive). Print the string S after lowercasing the K-th character in it.

Constraints

* 1 ≤ N ≤ 50
* 1 ≤ K ≤ N
* S is a string of length N consisting of `A`, `B` and `C`.

Input

Input is given from Standard Input in the following format:


N K
S


Output

Print the string S after lowercasing the K-th character in it.

Examples

Input

3 1
ABC


Output

aBC


Input

4 3
CABA


Output

CAbA
#include<iostream>
using namespace std;

int main(){
  int n,k; cin>>n >>k;
  char s[51]; 
  cin>>s;
  
  s[k-1] = s[k-1]-'A'+'a';
  cout<<s<<endl;
}