import java.util.Scanner;

public class P05_ChallengeTheWedding {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int mensCount = Integer.parseInt(scanner.nextLine());
        int womensCount = Integer.parseInt(scanner.nextLine());
        int maxTableCount = Integer.parseInt(scanner.nextLine());//3
        int tableSeats = maxTableCount * 2;//6

        int counter = 0;
        boolean isFinish = false;
        boolean isSeatsGone = false;
        while (!(tableSeats == counter)){
            for (int i = 1; i <= mensCount; i++) {
                for (int j = 1; j <= womensCount; j++) {
                    System.out.printf("(%d <-> %d) ", i , j);
                    counter+=2;
                    if (i == mensCount && j == womensCount){
                        isFinish = true;
                        break;
                    }
                    if (counter == tableSeats){
                        break;
                    }
                }
            }
            if (isFinish){
                break;
            }
        }
    }
}