Old PSLE Grading System

Problem Description

Remember the GPA calculator you did last week? Yes it is useful but.. for PSLE, we don't benchmark using GPAs. As such, you have to create a program that takes in a score, s, and output the corresponding grade. (A*, A, B, C, D, E, U)

The information required can be found here:

A*: 91 and above
A: 75 to 90
B: 60 to 74
C: 50 to 59
D: 35 to 49
E: 20 to 34
U: Below 20

Input

The input will be a single non-negative integer not exceeding 100, s.

Output

The grade that corresponds to the score given to the program.

Sample Input 1

90

Sample Output 1

A

Sample Input 2

50

Sample Output 2

C

Sample Input 3

97

Sample Output 3

A*