Problem Statement

A programming competition site AtCode regularly holds programming contests.

The next contest on AtCode is called ABC, which is rated for contestants with ratings less than $1200$.

The contest after the ABC is called ARC, which is rated for contestants with ratings less than $2800$.

The contest after the ARC is called AGC, which is rated for all contestants.

Takahashi's rating on AtCode is $R$. What is the next contest rated for him?

Constraints

• $0\le R\le 4208$
• $R$ is an integer.

Sample Input 1 Copy

1199

Sample Output 1 Copy

ABC

$1199$ is less than $1200$, so ABC will be rated.

Sample Input 2 Copy

1200

Sample Output 2 Copy

ARC

$1200$ is not less than $1200$ and ABC will be unrated, but it is less than $2800$ and ARC will be rated.

Sample Input 3 Copy

4208

Sample Output 3 Copy

AGC