Qual B

AtCoder

IDabc290_b

Time2000ms

Memory256MB

Difficulty—

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`. ## 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. ## Input The input is given from Standard Input in the following format: $N$ $K$ $S$ [samples]

Samples

Input #1

10 3
oxxoxooxox

Output #1

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 $3$\-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.

API Response (JSON)

{
  "problem": {
    "name": "Qual B",
    "description": {
      "content": "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 wa",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc290_b"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "There were $N$ contestants in the qualification round of a programming contest. All contestants got distinct ranks.  \nYou are given a length-$N$ string $S$, which represents whether the contestants wa...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

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