import java.util.ArrayList;

import java.util.Scanner;

import java.util.Comparator;

class CutTheNegativity{

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

ArrayList<Flight> flights = new ArrayList<>();

int n = sc.nextInt(), temp = 0, count = 0;

for (int i = 0; i < n; i++) {

for (int j = 0; j < n; j++) {

temp = sc.nextInt();

if (temp == -1) continue;

count++;

flights.add(new Flight(i+1, j+1, temp)); // depart, land, cost

}

}

flights.sort(new FlightComparator());

System.out.println(count);

printList(flights);

}

public static void printList(ArrayList<Flight> flights) {

for (Flight flight : flights) {

System.out.printf("%d %d %d \n", flight.depart, flight.land, flight.cost);

}

}

}

class FlightComparator implements Comparator<Flight>{

@Override

public int compare(Flight o1, Flight o2) {

if(o1.depart < o2.depart) return -1;

else if(o1.depart > o2.depart) return 1;

else{

if(o1.land < o2.land) return -1;

else if(o1.land > o2.land) return 1;

else return 0;

}

}

}

class Flight {

public int depart;

public int land;

public int cost;

Flight(int depart, int land, int cost) {

this.depart = depart;

this.land = land;

this.cost = cost;

}

}