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 Fortran (gfortran v4.8.4) (judge verdict: Accepted)

implicit none

character b

read(5,*)b

if(b=="A") then
write(6,*) "T"

else if(b=="T") then
write(6,*) "A"

else if(b=="C") then
write(6,*) "G"

else
write(6,*) "C"

endif




end