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 Common Lisp (SBCL 2.0.3) (judge verdict: Wrong Answer)

(let ((s (read-line)))
     (case s
       ("A" (princ "T"))
       ("T" (princ "A"))
       ("G" (princ "C"))
       ("C" (princ "G"))))
(fresh-line)