Problem2104--ABC126A - Changing a Character

2104: ABC126A - Changing a Character

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Time Limit : 1.000 sec  Memory Limit : 128 MB

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Description

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

Input is given from Standard Input in the following format: 

N K 
S

Output

Output

Print the string S after lowercasing the K-th character in it.

Sample Input Copy 

3 1
ABC

Sample Output Copy 

aBC

Source/Category

AtCoder 强 字符串 入门 基础  青铜 
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