String Delimiter

AtCoder

IDabc282_c

Time2000ms

Memory256MB

Difficulty—

You are given a string $S$ of length $N$ consisting of lowercase English letters, `,`, and `"`. It is guaranteed that $S$ contains an even number of `"`. Let $2K$ be the number of `"` in $S$. For each $i=1,2,\ldots,K$, the characters from the $(2i-1)$\-th `"` through the $(2i)$\-th `"` are said to be **enclosed**. Your task is to replace each `,` in $S$ that is **not** an enclosed character with `.` and print the resulting string. ## Constraints * $N$ is an integer between $1$ and $2\times 10^5$, inclusive. * $S$ is a string of length $N$ consisting of lowercase English letters, `,`, and `"`. * $S$ contains an even number of `"`. ## Input The input is given from Standard Input in the following format: $N$ $S$ [samples]

Samples

Input #1

8
"a,b"c,d

Output #1

"a,b"c.d

In $S$, `"a,b"` are enclosed characters, and `c,d` are not.
The `,` in $S$ that is not an enclosed character is the seventh character from the left in $S$, so replace that character with `.` to get the answer.

Input #2

5
,,,,,

Output #2

.....

Input #3

20
a,"t,"c,"o,"d,"e,"r,

Output #3

a."t,"c."o,"d."e,"r.

API Response (JSON)

{
  "problem": {
    "name": "String Delimiter",
    "description": {
      "content": "You are given a string $S$ of length $N$ consisting of lowercase English letters, `,`, and `\"`. It is guaranteed that $S$ contains an even number of `\"`. Let $2K$ be the number of `\"` in $S$. For each",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc282_c"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You are given a string $S$ of length $N$ consisting of lowercase English letters, `,`, and `\"`. It is guaranteed that $S$ contains an even number of `\"`.\nLet $2K$ be the number of `\"` in $S$. For each...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

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