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 Scala (2.11.7) (judge verdict: Accepted)


import java.util.Scanner


object Main {

  def main(args: Array[String]): Unit = {
    val sc = new Scanner(System.in)
    val n,k = sc.nextInt()
    val s = sc.next()
    val ms = s.toArray
    ms(k-1) = ms(k-1).toLower
    println(ms.mkString)
  }
}