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

public class Temp {
  public static void main(String[] args) throws FileNotFoundException {
    // open the file (i.e. set up the Scanner)
    Scanner input = new Scanner(new File("temp.txt"));
    
    int num1 = 0;
    int num2 = 0;
    
    // check if there's a number
    if (input.hasNextInt()) {
      // read the number and store it
      num1 = input.nextInt();
    }
    
    while (input.hasNextInt()) {
      // check if there's a number
      if (input.hasNextInt()) {
        // read another number and store it
        num2 = input.nextInt();
      }
      
      // find the difference and print it
      System.out.println("Temperature changed by " + (num2 - num1) + " deg F");
      
      num1 = num2;
    }
  }
}