10683: ABC126 —— A - Changing a Character
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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.
Input
Input is given from Standard Input in the following format:
```
$N$ $K$
$S$
```
```
$N$ $K$
$S$
```
Output
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`.
- $1 ≤ K ≤ N$
- $S$ is a string of length $N$ consisting of `A`, `B` and `C`.
Sample 1 Input
3 1
ABC
Sample 1 Output
aBC
Sample 2 Input
4 3
CABA
Sample 2 Output
CAbA