PROGRAMMING:Grade conversion

This problem requires the preparation of a program to convert a hundred point score into a five point score. Conversion rules:
-90 or more is a;
-B is less than 90 and greater than or equal to 80;
-C is less than 80 and greater than or equal to 70;
-D is less than 70 and greater than or equal to 60;
-Less than 60 is e.
###Input format:
Enter the percentage score that gives an integer in a line.
###Output format:
Output the corresponding five point score in one line.
###Input example:
```in
ninety
```
###Output example:
```out
A
```






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