import java.util.*;
import java.lang.*;
import java.io.*;

class Depo
{
	public static void main (String[] args) throws java.lang.Exception
	{
		double n, a;
		Scanner in = new Scanner(System.in);
		n=in.nextDouble();
		for(int i=1; i <=n; i++){
			a=in.nextDouble();
			if(i%2 != 0){
				a*=-1;
			}
			System.out.println(a);
		}
	}
}