#include <stdio.h>
int main (){
int N,K;
char S [55];	
scanf("%d %d",&N,&K);	
scanf("%s",S);	
--K;	
S[K]+=32;	
printf("%s",S);	
	return 0 ;
}
### Prompt

Please formulate 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 <stdio.h>
int main (){
int N,K;
char S [55];	
scanf("%d %d",&N,&K);	
scanf("%s",S);	
--K;	
S[K]+=32;	
printf("%s",S);	
	return 0 ;
}
```