Given between two and six cards, e.g.
A _ 3 _ 7 _ 6 _ 2
place one of the mathematical symbols (+,-,*,/) in the space between each pair of cards to make the equation equal 21.
The input will be a string, e.g.
The output should be a cell array of mathematical symbols in the order that satisfies the puzzle, e.g. for the string given above, the output would be:
Which means that A + 3 - 7 * 6 / 2 = 21.