import java.util.ArrayList;
import java.util.Scanner;


public class CoupleFrequency {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String input = in.nextLine();
        double couples = 0;
        double totalCouples = 0;

        String[] numbers = input.split(" ");
        ArrayList<String> used = new ArrayList<> ();

        for (int i = 0; i < numbers.length - 1; i++) {
        String couple = numbers[i] + " " + numbers[i + 1];
        if (used.contains(couple)) {
            continue;
        }
        else {
            used.add(couple);
            for (int j = 0; j < numbers.length - 1; j++) {
                String testCouple = numbers[j] + " " + numbers[j + 1];
                if (couple.equals(testCouple)) {
                    couples++;
                }
            }
        }
        totalCouples += couples;
        couples = 0;
        }

        used.clear();

        for (int i = 0; i < numbers.length - 1; i++) {
            String couple = numbers[i] + " " + numbers[i + 1];
            if (used.contains(couple)) {
                continue;
            }
            else {
                used.add(couple);
                for (int j = 0; j < numbers.length - 1; j++) {
                    String testCouple = numbers[j] + " " + numbers[j + 1];
                    if (couple.equals(testCouple)) {
                        couples++;
                    }
                }
            }
            System.out.printf("%s -> %.2f%%",couple, (couples / totalCouples) * 100);
            System.out.println();
            couples = 0;
        }
    }
}