Description

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.

1 ≤ N ≤ 50

1 ≤ K ≤ N

S is a string of length N consisting of A, B and C.

Format

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.

Samples

3 1
ABC

aBC