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 Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.*;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int S = sc.nextInt();
        int flag1 = 0;int flag2 = 0;
        int n[] = new int[2];
        int d = 100;
      
     for (int i = 0; i < 2; i++) {n[i]=(S/d);S%=d;d/=100;}
     if(n[0]>=0){if(n[1]>00&&n[1]<13){flag1=1;}}
     if(n[0]>00&&n[0]<13){if(n[1]>=0){flag2=1;}}
      
     if(flag1==1&&flag2==1){System.out.print("AMBIGUOUS");}
     else if(flag1 == 1){System.out.print("YYMM");}
     else if(flag2 == 1){System.out.print("MMYY");}
     else {System.out.print("NA");}
      

	}
}