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

/*
Jessica Miller, CSE 142
This program reads input from a file containing temperature values and reports
the different between each pair of temperatures.
*/
public class Temperatures {
    public static void main(String[] args) throws FileNotFoundException {
		File f = new File("weather2.txt");
		Scanner input = new Scanner(f);
		
		double prev = input.nextDouble();
		
		while (input.hasNext()) {
			if (input.hasNextDouble()) {
				double next = input.nextDouble();
				System.out.printf("%.1f to %.1f, change = %.1f\n", prev, next, next - prev);
				prev = next;
			} else {
				input.next();
			}
		}
    }
}