For given input matrix a, rotate it by 90 degrees and find the sum of the diagonals.
1 2 3 4
5 6 7 8
8 10 12 -2
-1 -3 -5 -7
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Number of digits in an integer
Convert Fahrenheit to Celsius
Raise each element to the power of its index in a matrix
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Product of all elements in an array
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