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.io.*;
 
import java.text.*;
import java.util.*;
 
public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		char b = sc.next().charAt(0);
		String msg = "";

		if (b == 'A')  {
			msg = "T";
		} else if (b == 'T') {
			msg = "A";
		} else if (b == 'C') {
			msg = "G";
		} else {
			msg = "C";
		}
		System.out.println(msg);
	}
}