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: Wrong Answer)

import java.util.Scanner;

public class Main {
	public static void main(String args[]) {
		Scanner bui = new Scanner(System.in);
		String s = bui.next();


		int max=0;
		int count = 0;
		String maxs="";
		for(int i=0;i<s.length();i++) {
			switch(s.charAt(i)) {
			case'A':
				count++;
				break;
			case'C':
				count++;
				break;
			case'G':
				count++;
				break;
			case'T':
				count++;
				break;
			default:
				if(max<count) {
					max = count;
					maxs = s.substring(i-count, i);
				}
				count=0;

				break;
			}



		}
		if(maxs.length()!=0) {
		System.out.println(maxs);
		}else {
			System.out.println(0);
		}
	}
}