#include<stdio.h>
int main(void){
  int n,k;
  char s[55];
  scanf("%d %d",&n,&k);
  scanf("%s",s);
  s[k-1]+=32;
  printf("%s\n",s);
  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<stdio.h>
int main(void){
  int n,k;
  char s[55];
  scanf("%d %d",&n,&k);
  scanf("%s",s);
  s[k-1]+=32;
  printf("%s\n",s);
  return 0;
}
```