Double Helix

AtCoder
IDabc122_a
Time2000ms
Memory256MB
Difficulty
On the Planet AtCoder, there are four types of bases: `A`, `C`, `G` and `T`. `A` bonds with `T`, and `C` bonds with `G`. You are given a letter $b$ as input, which is `A`, `C`, `G` or `T`. Write a program that prints the letter representing the base that bonds with the base $b$. ## Constraints * $b$ is one of the letters `A`, `C`, `G` and `T`. ## Input Input is given from Standard Input in the following format: $b$ [samples]
Samples
Input #1
A
Output #1
T
Input #2
G
Output #2
C
API Response (JSON)
{
  "problem": {
    "name": "Double Helix",
    "description": {
      "content": "On the Planet AtCoder, there are four types of bases: `A`, `C`, `G` and `T`. `A` bonds with `T`, and `C` bonds with `G`. You are given a letter $b$ as input, which is `A`, `C`, `G` or `T`. Write a pro",
      "description_type": "Markdown"
    },
    "platform": "AtCoder",
    "limit": {
      "time_limit": 2000,
      "memory_limit": 262144
    },
    "difficulty": "None",
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "abc122_a"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "On the Planet AtCoder, there are four types of bases: `A`, `C`, `G` and `T`. `A` bonds with `T`, and `C` bonds with `G`.\nYou are given a letter $b$ as input, which is `A`, `C`, `G` or `T`. Write a pro...",
      "is_translate": false,
      "language": "English"
    }
  ]
}
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