RPN = function(inputText)
    tokens = inputText.split
    stack = []
    while tokens
        tok = tokens.pull
        if "+-*/^".indexOf(tok) != null then
            b = stack.pop
            a = stack.pop
            if tok == "+" then stack.push a + b
            if tok == "-" then stack.push a - b
            if tok == "*" then stack.push a * b
            if tok == "/" then stack.push a / b
            if tok == "^" then stack.push a ^ b
        else
            stack.push val(tok)
        end if
        print tok + " --> " + stack
    end while
    return stack[0]
end function

print RPN("3 4 2 * 1 5 - 2 3 ^ ^ / +")