A Unique Letter

AtCoder

IDabc260_a

Time2000ms

Memory256MB

Difficulty—

You are given a string $S$ of length $3$. Print a character that occurs only once in $S$. If there is no such character, print `-1` instead. ## Constraints * $S$ is a string of length $3$ consisting of lowercase English letters. ## Input Input is given from Standard Input in the following format: $S$ [samples]

Samples

Input #1

pop

Output #1

o

`o` occurs only once in `pop`.

Input #2

abc

Output #2

a

`a`, `b`, and `c` occur once each in `abc`, so you may print any of them.

Input #3

xxx

Output #3

\-1

No character occurs only once in `xxx`.

API Response (JSON)

{
  "problem": {
    "name": "A Unique Letter",
    "description": {
      "content": "You are given a string $S$ of length $3$.   Print a character that occurs only once in $S$.   If there is no such character, print `-1` instead.",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc260_a"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "You are given a string $S$ of length $3$.  \nPrint a character that occurs only once in $S$.  \nIf there is no such character, print `-1` instead.\n\n## Constraints\n\n*   $S$ is a string of length $3$ cons...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments