#include <stdio.h>
int main() {
	int n,k;
	scanf("%d %d",&n,&k);
	char str[n+1];
	scanf("%s",&str);
	str[k-1] += 32;
	printf("%s",str);
	return 0;
}
### 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 <stdio.h>
int main() {
	int n,k;
	scanf("%d %d",&n,&k);
	char str[n+1];
	scanf("%s",&str);
	str[k-1] += 32;
	printf("%s",str);
	return 0;
}
```