Description

Little Leaf just learned about negative numbers and finds them very interesting. A negative number is simply a positive number preceded by a minus sign ("-"). To better visualize this, Little Leaf decides to write a program that outputs a negative number regardless of whether the input is positive or negative. For example: if the input is 1, the output should be -1; if the input is -1.5, the output should remain -1.5.

Input Format

A non-zero number (the number does not exceed 6 digits).

Output Format

A negative number.

-3.01

-3.01

1

-1