Convert a numerical score to a letter grade using the following scale:

  • 90-100: 'A'
  • 80-89: 'B'
  • 70-79: 'C'
  • 60-69: 'D'
  • Below 60: 'F'

Return 'Invalid Score' for scores outside the range 0-100.

Examples:

Input: score = 85 Output: 'B' Explanation: 85 is between 80 and 89, so the grade is 'B' Input: score = 92 Output: 'A' Explanation: 92 is between 90 and 100, so the grade is 'A' Input: score = 105 Output: 'Invalid Score' Explanation: 105 is greater than 100, which is outside the valid range
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