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

int main()
{
	int n,k;
	cin>>n>>k;
	string s;
	cin>>s;

	s[k-1]+=('a'-'A');
	cout<<s<<"\n";
	return 0;
}
### 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]+=('a'-'A');
	cout<<s<<"\n";
	return 0;
}
```