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Your task is to solve an equation of the form f(x) = 0 where f(x) is written in postfix notation with numbers, operations +, -, *, /, and at most one occurrence of a variable x.
For example, f(x) for an equation (4x + 2)⁄2 = 0 is written as:
4 X * 2 + 2 /
The solution for f(x) = 0 is x = −1⁄2.
The input file consists of a single line with at most 30 tokens separated by spaces. Each token is either:
The input file contains a correct representation of f(x) in postfix notation where token X occurs at most once. There is no division by a constant zero in this equation, that is, there always exists a value of x, such that f(x) can be evaluated without division by zero.
Write to the output file:
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