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 s=0;
 
int x=0;
int y=0;
  
scanf("%d",&s);
  
x=s/100;
y=s%100;
  
if(x>=1 && x<=12){
	if(y>=1 && y<=12){
    printf("AMBIGUOUS");
    }else {printf("MMYY");}
}else if(y>=1 && y<=12){
printf("YYMM");
}else{
printf("NA");
}
return 0; 
}