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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;

int main(){
  int s,f,l;
  cin >> s;
  
  f = s/100;
  l = s%100;
  
  if(f<13  && l<13){
    cout << "AMBIGUOUS" << endl;
  } else if(f<13){
    cout << "MMYY" << endl;
  } else if(l<13){
    cout << "YYMM" << endl;
  } else{
    cout << "NA" << endl;
  }
  return 0;
}