Changing a Character

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.

Examples

Input

3 1 ABC

Output

aBC

Input

4 3 CABA

Output

CAbA

inputFormat

Input

Input is given from Standard Input in the following format:

N K S

outputFormat

Output

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

Examples

Input

3 1 ABC

Output

aBC

Input

4 3 CABA

Output

CAbA

样例

4 3
CABA

CAbA