说明

Give a score value defined by a integer ranged from 0~100, please write a program to calculate the score defined by letters ranged from A to E
A means the score value is greater than 89
B means the score value is greater than 79 but lower than 90
C means the score value is greater than 69 but lower than 80
D means the score value is greater than 59 but lower than 70
E means the score value is lower than 60

输入格式

One integer range from 0 to 100.

输出格式

One letter, which is calculated by the given integer.

90

A