import java.io.File;
import java.util.Scanner;
import java.util.ArrayList;
public class RunStatisticsTKimPeriod7 {
    public static void main(String[] args) {
        StatisticsTKimPeriod7 stats = new StatisticsTKimPeriod7();
        File data = new File("numbers.txt");
        Scanner in = null;
        try {
            in = new Scanner(data);
        }
        catch (java.io.FileNotFoundException e) {
            System.out.println(e.getMessage());
        }
        ArrayList<Integer> list = new ArrayList<Integer>();
        while (in.hasNext()) {
            list.add(in.nextInt());
        }
        double average = stats.average(list);
        System.out.printf("%.2f\n", average);
        System.out.printf("%.2f\n", stats.sDev(list, average));
        System.out.println(stats.mode(list));
    }
}
class StatisticsTKimPeriod7 {

    public double average(ArrayList<Integer> data) {
        long sum = 0;
        for (int i = 0; i < data.size(); i++) {
            sum += data.get(i);
        }
        return (double)(sum) / data.size();
    }

    public double sDev(ArrayList<Integer> data, double average) {
        double sDev = 0;
        for (int i = 0; i < data.size(); i++) {
            sDev += Math.pow((double)(data.get(i)) - average, 2);
        }
        return Math.sqrt(sDev / (data.size() - 1));
    }

    public ArrayList<Integer> mode(ArrayList<Integer> data) {
        ArrayList<Integer> listCounts = new ArrayList<Integer>();
        ArrayList<Integer> listModes = new ArrayList<Integer>();
        int count = 0;
        for (int i : data) {
            int x = i;
            int tempCount = 1;
            for (int j : data) {
                int y = j;
                if (x == y) {
                    tempCount++;
                }
                if (tempCount > count) {
                    count = tempCount;
                }
            }
            listCounts.add(tempCount);
        }
        for (int k = 0; k < listCounts.size(); k++) {
            if (listCounts.get(k) == count && !(listModes.contains(data.get(k)))) {
                listModes.add(data.get(k));
            }
        }
        return listModes;
    }
}