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BeginnerConditionals2000 ms256 MB

Grade Calculator

Given a numeric score, print the matching letter grade.

Statement

Given a numeric score, print the matching letter grade.

Input

One integer score from 0 to 100.

Output

A, B, C, D, or F.

Constraints

  • `0 <= score <= 100`

Examples

Example 1

Input

87

Output

B

Scores from 80 to 89 earn B.

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