#include<stdio.h>
#include<math.h>


int main(){

    int n = 0;
    int a[100000];
    while (true)
    {
        int tmp;
        scanf("%d", &tmp);
        if (tmp == 9999) break;
        a[n] = tmp;
        n++;
    }
    printf("%d\n",n);
    // sap xep giam dan
    for(int i=0;i<n-1;i++){
        for(int j=i+1;j<n;j++){
            if (a[j] > a[i]){
                int tmp = a[j];
                a[j] = a[i];
                a[i] = tmp;
            }
        }
    }
    printf("Chuoi sap xep giam dan: ");
    for(int i=0;i<n;i++) printf("%d ",a[i]);
    printf("\n");

    // tinh dac trung

    // gia tri trung binh
    float average = 0;
    for(int i=0;i<=n;i++){
        average += (float)a[i];
    }
    average /= (float)n;
    printf("Gia tri trung binh: %f\n" , average);

    // phuong sai
    float D = 0;
    for(int i=0;i<=n;i++){
        D += a[i]*a[i];
    }
    D /= float(n-1);
    D -= average*average;
    printf("Phuong sai: %f\n",D);

    // do lech chuan

    float G = sqrt(D);
    printf("do lech chuan: %f",G);

    return 0;
}