// Allison Obourn
// Displays changes in temperature based on a data file.

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

public class Temperatures {
	public static void main(String[] args) throws FileNotFoundException {
		Scanner input = new Scanner(new File("weather.txt"));
		
		double first = input.nextDouble();
		while(input.hasNext()) {
			if (input.hasNextDouble()) {
				double second = input.nextDouble();
				System.out.printf("%.1f to %.1f, change = %.1f\n", first, second, (second - first));
				first = second;
			} else {
				input.next();
			}
		}
	}
}