#include<bits/stdc++.h>
using namespace std;
string a;
int l,c;
int main(){
	cin>>l>>c>>a;
	a[c-1]+=32;
	cout<<a;
	return 0;
}

### Prompt

Your challenge is to write a Cpp solution to the following problem:

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

### Response

```cpp
#include<bits/stdc++.h>
using namespace std;
string a;
int l,c;
int main(){
	cin>>l>>c>>a;
	a[c-1]+=32;
	cout<<a;
	return 0;
}

```