Mobile coding works. A laptop is faster for long sessions.
Problem
Given a student's score (an integer), determine their grade based on the following criteria:
- 90-100: A
- 80-89: B
- 70-79: C
- 60-69: D
- Below 60: F
Input format
Input
input.txt
- A single integer: score (0 ≤ score ≤ 100)
Output format
Output
output.txt
- A single character: the grade (A, B, C, D, or F)
Example
input
85
output
B
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Sample cases (from the problem)
Sample Case 1
Input
85
Expected output
B
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