#include <iostream>
using namespace std;

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

  s[k-1]+=32;
  cout << s;
}
### Prompt

Please provide a CPP coded solution to the problem described below:

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 <iostream>
using namespace std;

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

  s[k-1]+=32;
  cout << s;
}
```