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>
#include<string.h>
int main(void)
{
   int s, smt34, smt12;

   scanf("%d", &s);

   smt34 = s % 100;
   smt12 = s / 100;
   char cs[][10]= {"YYMM", "MMYY", "AMBIGUOUS", "NA"};

   if((smt34 <=12 && smt34 > 0) && (smt12 <= 12 && smt12 > 0))
      printf("%s", cs[2]);

   else if(smt12 <= 12 && smt12 > 0)
      printf("%s", cs[1]);

   else if(smt34 <=12 && smt34 > 0)
      printf("%s",cs[0]);

   else printf("%s", cs[3]);

   return 0;
   
}