Convert Percentage Grade to Five-Level Grade

Problem Description

Write a program to convert a percentage grade into a five-level grade. The rules are:

• Greater than or equal to $90$: grade A;
• Less than $90$ and greater than or equal to $80$: grade B;
• Less than $80$ and greater than or equal to $70$: grade C;
• Less than $70$ and greater than or equal to $60$: grade D;
• Less than $60$: grade E.

Input Format

One line giving an integer percentage grade.

Output Format

One line giving the corresponding five-level grade.

Sample Input 1

95

Sample Output 1

A

Sample Input 2

55

Sample Output 2

E

Constraints

$0 \le$ input grade $\le 100$

Hint

• Five-band range judgment. Think about whether judging from large to small or small to large lets you write shorter conditions — you need not write both bounds every time.
• Get the boundaries exact: $90$ belongs to A, $89$ belongs to B.
• Check against the sample: 95 → A, 55 → E.