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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;
public class Main {
	public static void main(String[] args) throws Exception {
		Scanner scan=new Scanner(System.in);
		String a=scan.next();
		//int b=scan.nextInt();
		//int c=scan.nextInt();
		boolean bool=false;
		String ans="";
if(a.equals("A")) {
			ans="T";
		}
if(a.equals("C")) {
	ans="G";
}
if(a.equals("T")) {
	ans="A";
}
if(a.equals("G")) {
	ans="C";
}
		
		System.out.println(ans);
	}
	}