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 C++ (GCC 9.2.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;

int main(void){
 
 char a;
 cin >> a;
 
 if(a == 'A'){
     cout << 'T' <<endl;
 }
 else if('T'){
     cout << 'A' <<endl;
 }
 else if('G'){
     cout << 'C' <<endl;
 }
 else{
     cout << 'G' << endl;
 }
}