Determine the letter grade based on a numeric score. Return 'A' for scores 90-100, 'B' for 80-89, 'C' for 70-79, 'D' for 60-69, and 'F' for scores below 60.
Examples:
Input: score = 95
Output: 'A'
Explanation: 95 is in the range 90-100, so it receives an 'A' grade
Input: score = 58
Output: 'F'
Explanation: 58 is below 60, so it receives an 'F' grade
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