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 JavaScript (node.js v5.12) (judge verdict: Accepted)

function Main(input){
  
  var str = input.trim()
  
  if(str=="A"){
    console.log("T");
  }else if(str=="T"){
    console.log("A");
  }else if(str=="C"){
    console.log("G");
  }else if(str=="G"){
    console.log("C");
  }
 
}//function end
 
Main(require("fs").readFileSync("/dev/stdin", "utf8"));