#include<bits/stdc++.h>
using namespace std;

int main ()
{
	int n,k; cin>>n>>k;
	string s; cin>>s;
	
	s[k-1]+=32;
	cout<<s<<endl;
	


}


### Prompt

Please create a solution in Cpp 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;

int main ()
{
	int n,k; cin>>n>>k;
	string s; cin>>s;
	
	s[k-1]+=32;
	cout<<s<<endl;
	


}


```