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(void){
int num,a,b;
scanf("%d",&num);
 
a = num/100;
b = num - a*100;
 
if(1<=a && a<=12)
{
  if(1<=b && b<=12)
  {
    printf("AMBIGUOUS");
  }
  else
  {
    printf("MMYY");
  }
}
else
{
  if(1<=b && b<=12)
  {
    printf("YYMM");
  }
  else
  {
    printf("NA");
  }
}
return(0);
}