Problem:
Score : 100 points

Problem Statement

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

Output

Print the letter representing the base that bonds with the base b.

Sample Input 1

A

Sample Output 1

T

Sample Input 2

G

Sample Output 2

C

Solution in Scala (2.11.7) (judge verdict: Accepted)

import scala.collection.immutable.Map
import scala.io.StdIn._

object Main{
  type UnitedStateOfAmerica = Map[Char, Char]
  val Data : UnitedStateOfAmerica = Map('A' -> 'T', 'T' -> 'A', 'C' -> 'G', 'G' -> 'C')
  def main(args: Array[String]): Unit ={
    val cr : Char = readChar()
    println(Data(cr))
  }
}