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: Accepted)

    #include<stdio.h>
    #include<string.h>
    int main(void){
    int A,B,C,D,E,N,M,x,y,i,j,cou=0,cou2=99999999,v[1000000],w[1000000],min_i,en=0;
        char S[100],W[100],s[10],X,Y;
    scanf("%c",&X);
    if(X=='A'){
        printf("T");
    }
    else if(X=='T'){
        printf("A");
    }
    else if(X=='C'){
        printf("G");
    }
    else if(X=='G'){
        printf("C");
    }
    
    return 0;
    }