Problem:
Score : 100 points

Problem Statement

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.

Sample Input 1

3 1
ABC

Sample Output 1

aBC

Sample Input 2

4 3
CABA

Sample Output 2

CAbA

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
 
int main()
{
 
   int n,k;
   scanf("%d%d",&n,&k);
  char s[n+1];
  scanf("%s",&s);
  int i;
  for(i=0;i<n;++i)
  {
     if(i+i==k)
     {
       if(s[i]>='A' && s[i]<='Z')
           printf("%c",s[i]+32);
       
       else
          printf("%c",s[i]);
     }
    
    else
       printf("%c",s[i]);
  }
  
  
}