Exclusive Grade Classification

Source: Phước Hưng OJ

Version: Phuoc Hung OJ Extended

Problem Statement

Given a real score x between 0 and 10, print A for x >= 9; otherwise B for x >= 7; otherwise C for x >= 5; otherwise D for x >= 3; otherwise E. Exactly one grade is printed. PHOJ input decimals have at most six digits after the decimal point.

Input

One real number x written in decimal notation with a period.

Output

Print one uppercase letter: A, B, C, D or E.

Subtasks

• Subtask 1 (20%): x is an integer from 0 to 10.
• Subtask 2 (30%): x is between 0 and 10, with at most one digit after the decimal point.
• Subtask 3 (50%): x is between 0 and 10, with at most six digits after the decimal point.

Examples

Example 1

Input

8.5

Output

B

Explanation

8.5 does not reach 9 but reaches 7, so grade B is selected.

Example 2

Input

3.0

Output

D

Explanation

3.0 meets the D threshold but not C.