Equation for the 5-th class!#7411

Equation for the 5-th class!

1 second

128 megabytes

Very easy

The equation for the fifth grader is a line of length $5$ symbols. The second symbol in the line is either a sign '+' (plus) or '-' (minus), the fourth symbol is a sign '=' (equals to). Among the first, third and fifth symbols exactly two are digits in the range from $0$ to $9$ , and one is a letter $x$ that is a variable.

Write a program to solve the given equation with respect to $x$ .

Input

One line with the given equation.

Output

Print one number - the value of $x$ .

Examples

Example 1

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Example 2

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