I have seen multiple problems like this but none of them have a robust test suite associated with them.
The first input C is a char and CA is the ascii code for that char;
The second input A is a number and AC is the char from that ascii code.
Check to see if a Sudoku Puzzle is Solved
Solve the set of simultaneous linear equations
Area of a Square
Find the nearest prime number
Brain Teaser Solver
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