#503 Evaluating Reverse Polish Notation

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Implement a function that evaluates an arithmetic expression written in Reverse Polish Notation.

Allowed operators: +, -, *, /:

Examples:

["2", "1", "+", "3", "*"] = 9

["4", "13", "5", "/", "+"] =6

["2", "+"] = error

["5", "0", "/"] = error

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