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 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
int main(void)
{ char cl[]={'A','T','G','C'};
  char b;
  int i;
  scanf("%c",&b);
 if(b=='T')i=0;
 if(b=='A')i=1;
 if(b=='G')i=3;
 if(b=='C')i=2;
 printf("%c",cl[i]);
 printf("%d",i);
 return 0;
}