import java.util.Scanner;

public class battles201116 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int firstCount = Integer.parseInt(scan.nextLine());
        int secondCount = Integer.parseInt(scan.nextLine());
        int max = Integer.parseInt(scan.nextLine());
        int counter = 0;

        for(int i=1 ; i<=firstCount ; i++){
            for(int j=1 ; j<=secondCount ; j++){
                counter++;
                if (counter > max){
                    break;
                }
                System.out.printf("(%d <-> %d) ",i,j);
            }
        }
    }
}