// Reads a file of temperaturens and outputs the difference 
// between each pair of temperatures.

import java.io.*;   // file
import java.util.*; // scanner

public class Temperatures {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner input = new Scanner(new File("temp.txt"));
        
        // fencepost problem -- must read one int outside loop
        int temp1 = input.nextInt();
        
        while (input.hasNextInt()) {
            int temp2 = input.nextInt();
            System.out.println("Temperature changed by " + (temp2 - temp1) + " deg F");
            temp1 = temp2;
        }
    }
}