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 Kotlin (1.0.0) (judge verdict: Accepted)

import java.util.*

object MainKt {
	@JvmStatic
	fun main(args: Array<String>) {
		val scanner = Scanner(System.`in`)
		val b: String = scanner.next()

		when(b){
			"A" -> println("T")
			"T" -> println("A")
			"C" -> println("G")
			"G" -> println("C")
		}
	}

}