### Problem Statement

There were $N$ contestants in the qualification round of a programming contest. All contestants got distinct ranks.  
You are given a length-$N$ string $S$, which represents whether the contestants want to participate in the final round or not. Specifically,

-   if the $i$-th character of $S$ is `o`, the contestant ranked $i$-th in the qualification wants to participate in the final;
-   if the $i$-th character of $S$ is `x`, the contestant ranked $i$-th in the qualification does not want to participate in the final.

Among those who want to participate in the final, $K$ contestants with the smallest ranks advance to the final.

Print a string $T$ of length $N$ that satisfies the following conditions:

-   if the contestant ranked $i$-th in the qualification advances to the final, the $i$-th character of $T$ is `o`;
-   if the contestant ranked $i$-th in the qualification does not advance to the final, the $i$-th character of $T$ is `x`.

### Input

The input is given from Standard Input in the following format:

```
$N$ $K$
$S$
```

### Output

Print the answer.

### Constraints

-   $N$ and $K$ are integers.
-   $1 \le K \le N \le 100$
-   $S$ is a string of length $N$ consisting of `o` and `x`.
-   $S$ has at least $K$ `o`'s.

oxxoxoxxxx

In this input, N=10 people took part in the qualification round, and K=3 of them advance to the final.

• The participant who ranked 1-st in the qualification wants to participate in the final, so the participant advances to the final. 1 participant has advanced so far.
• The participants who ranked 2-nd and 33-rd in the qualification do not want to participate in the final, so the participants do not advance to the final.
• The participant who ranked 4-th in the qualification wants to participate in the final, so the participant advances to the final. 2 participants have advanced so far.
• The participants who ranked 5-th in the qualification does not want to participate in the final, so the participant does not advance to the final.
• The participant who ranked 6-th in the qualification wants to participate in the final, so the participant advances to the final. 3 participants have advanced so far.
• Now that 3 people have advanced to the final, no participants ranked 7-th or lower advance to the final.