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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