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)

asm ( "\
        .globl  main               \n\
main:                              \n\
        subq    $8, %rsp           \n\
        movq    stdin(%rip), %rdi  \n\
        call    getc@PLT           \n\
        movl    $67, %edi          \n\
        cmpb    $65, %al           \n\
        je      .L2                \n\
        cmpb    $67, %al           \n\
        je      .L4                \n\
        cmpb    $71, %al           \n\
        je      .L5                \n\
        movsbl  %al, %edi          \n\
        cmpb    $84, %al           \n\
        movl    $71, %eax          \n\
        cmove   %eax, %edi         \n\
.L2:                               \n\
        movq    stdout(%rip), %rsi \n\
        movb    %dil, b(%rip)      \n\
        call    putc@PLT           \n\
        xorl    %eax, %eax         \n\
        addq    $8, %rsp           \n\
        ret                        \n\
.L4:                               \n\
        movl    $65, %edi          \n\
        jmp     .L2                \n\
.L5:                               \n\
        movl    $84, %edi          \n\
        jmp     .L2                \n\
        .comm   b,1,1              \n"
);