CF

AtCoder

IDcodefestival_2016_qualC_a

Time1000ms

Memory256MB

Difficulty—

This contest is `CODEFESTIVAL`, which can be shortened to the string `CF` by deleting some characters. Mr. Takahashi, full of curiosity, wondered if he could obtain `CF` from other strings in the same way. You are given a string $s$ consisting of uppercase English letters. Determine whether the string `CF` can be obtained from the string $s$ by deleting some characters. ## Constraints * $2 ≤ |s| ≤ 100$ * All characters in $s$ are uppercase English letters (`A`\-`Z`). ## Input The input is given from Standard Input in the following format: $s$ [samples]

Samples

Input #1

CODEFESTIVAL

Output #1

Yes

`CF` is obtained by deleting characters other than the first character `C` and the fifth character `F`.

Input #2

FESTIVALCODE

Output #2

No

`FC` can be obtained but `CF` cannot be obtained because you cannot change the order of the characters.

Input #3

CF

Output #3

Yes

It is also possible not to delete any characters.

Input #4

FCF

Output #4

Yes

`CF` is obtained by deleting the first character.

API Response (JSON)

{
  "problem": {
    "name": "CF",
    "description": {
      "content": "This contest is `CODEFESTIVAL`, which can be shortened to the string `CF` by deleting some characters. Mr. Takahashi, full of curiosity, wondered if he could obtain `CF` from other strings in the same",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 1000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "codefestival_2016_qualC_a"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "This contest is `CODEFESTIVAL`, which can be shortened to the string `CF` by deleting some characters.\nMr. Takahashi, full of curiosity, wondered if he could obtain `CF` from other strings in the same...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments