ABD

AtCoder

IDabc099_a

Time2000ms

Memory256MB

Difficulty—

Decades have passed since the beginning of AtCoder Beginner Contest. The contests are labeled as `ABC001`, `ABC002`, $...$ from the first round, but after the $999$\-th round `ABC999`, a problem occurred: how the future rounds should be labeled? In the end, the labels for the rounds from the $1000$\-th to the $1998$\-th are decided: `ABD001`, `ABD002`, $...$, `ABD999`. You are given an integer $N$ between $1$ and $1998$ (inclusive). Print the first three characters of the label of the $N$\-th round of AtCoder Beginner Contest. ## Constraints * $1 \leq N \leq 1998$ * $N$ is an integer. ## Input Input is given from Standard Input in the following format: $N$ [samples]

Samples

Input #1

Output #1

ABC

The $999$\-th round of AtCoder Beginner Contest is labeled as `ABC999`.

Input #2

Output #2

ABD

The $1000$\-th round of AtCoder Beginner Contest is labeled as `ABD001`.

Input #3

Output #3

ABD

The $1481$\-th round of AtCoder Beginner Contest is labeled as `ABD482`.

API Response (JSON)

{
  "problem": {
    "name": "ABD",
    "description": {
      "content": "Decades have passed since the beginning of AtCoder Beginner Contest. The contests are labeled as `ABC001`, `ABC002`, $...$ from the first round, but after the $999$\\-th round `ABC999`, a problem occur",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc099_a"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "Decades have passed since the beginning of AtCoder Beginner Contest.\nThe contests are labeled as `ABC001`, `ABC002`, $...$ from the first round, but after the $999$\\-th round `ABC999`, a problem occur...",
      "is_translate": false,
      "language": "English"
    }
  ]
}

Full JSON Raw Segments