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Score : $100$ points

### 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

• $0 ≤ R ≤ 4208$
• $R$ is an integer.

### Input

Input is given from Standard Input in the following format:

$R$


### Output

Print the name of the next contest rated for Takahashi (ABC, ARC or AGC).

### Sample Input 1

1199


### Sample Output 1

ABC


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

### Sample Input 2

1200


### Sample Output 2

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

4208


### Sample Output 3

AGC