#include<iostream>

#include<bits/stdc++.h>

using namespace std;

struct c {

    int a;

    struct c *k;
};
                struct c *s=0;

            struct c *p= 0;

        void come(int x){

        struct c *m;

    m = (c*) malloc (sizeof(c));

    m->a=x;

    m->k=0;

    if(s==0 && p==0){s=p=m;}

    else{p->k=m;p=m;}
}
    void show ()
    {
            struct c *t;

            if(s==0 && p==0){cout << "Line Empty" << endl;}
            else{t=s;while (t!=0){ cout << endl << " " << t->a << endl;
            t=t->k;
    }
    }
    }

    void out (int y){
        struct c *o;
        o=s;
        if(s == 0 && p==0)
        {
          cout << "Empty Line" << endl;
        }
        else{
                s=s->k;
                free(o);
        }
    }

    int main()

    {
        cout << "    Make a safe distance bewtten each other" << endl;
        int i,n,j;
        cout <<   endl << "     Total number of people today : ";
        cin >> j;
        for(i=1;i<=j;i++){come(i);}
        show();
        out(1);
        show();
        out(2);
        show();
        out(3);
        show();
        out(4);
        show();
        out(5);
        show();
        out(6);
        show();
    }