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) {
        Scanner scanner = new Scanner(System.in);

        String b = scanner.nextLine();

        String ret = "";
        for (char c: b.toCharArray()) {
            switch (c) {
                case 'A':
                    ret += "T";
                    break;
                case 'T':
                    ret += "A";
                    break;
                case 'C':
                    ret += "G";
                    break;
                case 'G':
                    ret += "C";
                    break;
            }
        }
        System.out.println(ret);
    }

}