import java.util.Scanner;
import java.io.File;
import java.io.PrintStream;
import java.io.FileNotFoundException;

/**
 * Solution to Skyline problem.
 * @author Dave Reed
 */
public class Skyline {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner infile = new Scanner(new File("input1.txt"));
        PrintStream outfile = new PrintStream("output1.txt");

        int[] skyline = new int[10001];
        for (int i = 0; i < skyline.length; i++) {
            skyline[i] = 0;
        }

	while (infile.hasNextInt()) {
            int left = infile.nextInt();
            int height = infile.nextInt();
            int right = infile.nextInt();
            for (int bldg = left; bldg < right; bldg++) {
		if (height > skyline[bldg]) {
                    skyline[bldg] = height;
                }
	    }
	}

	boolean first = true;
	for (int i = 0; i < 10000; i++) {
	    if (skyline[i] != skyline[i+1]) {
		if (first) {
  		    first = false;
		}
		else {
		    outfile.print(" ");
		}
		outfile.print((i+1) + " " + skyline[i+1]);
	    }
	}
        outfile.println();
    }
}