题目描述
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).
Examples
Input
1199
Output
ABC
Input
1200
Output
ARC
Input
4208
Output
AGC
输入格式
见题面
输出格式
见题面
样例输入
1199
样例输出
ABC