101040: [AtCoder]ABC104 A - Rated for Me
Memory Limit：256 MB
Time Limit：2 S
Judge Style：Text Compare
Creator：
Submit：0
Solved：0
Description
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