10482: ABC104 —— A - Rated for Me
[Creator : ]
Description
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?
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?
Input
Input is given from Standard Input in the following format:
```
$R$
```
```
$R$
```
Output
Print the name of the next contest rated for Takahashi (`ABC`, `ARC` or `AGC`).
Constraints
- $0 ≤ R ≤ 4208$
- $R$ is an integer.
- $R$ is an integer.
Sample 1 Input
1199
Sample 1 Output
ABC
1199 is less than 1200, so ABC will be rated.
Sample 2 Input
1200
Sample 2 Output
ARC
1200 is not less than 1200 and ABC will be unrated, but it is less than 2800 and ARC will be rated.
Sample 3 Input
4208
Sample 3 Output
AGC