import java.util.Scanner;

public class UniquePINCodes {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int x = Integer.parseInt(scanner.nextLine());
        int y = Integer.parseInt(scanner.nextLine());
        int n = Integer.parseInt(scanner.nextLine());



        for (int i = 2; i <= x ; i += 2) {
            for (int j = 2; j <= y ; j++) {
                if(j == 2 || j == 3 || j == 5 || j == 7){
                }



                for (int k = 2; k <= n; k += 2) {

                    System.out.printf("%d %d %d %n", i, j, k);
                }
            }
        }
    }
}