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#include "pch.h"
#include <iostream>
#include <time.h>
using namespace std;
struct tstk {
    int inf;
    tstk *a;
}*a, *b;

tstk *AddStask(tstk  *sp, int inf) {
    tstk *spt = new tstk;
    spt->inf = inf;
    spt->a = sp;
    return spt;
}

tstk *ReadStackD(tstk *sp, int &inf) {
    if (sp == NULL) return NULL;
    tstk *spt = sp;
    inf = sp->inf;
    sp = sp->a;
    delete spt;
    return sp;
}

tstk *DelStackAll(tstk *sp) {
    tstk *spt; int inf;
    while (sp != NULL) {
        spt = sp;
        inf = sp->inf;
        sp = sp->a;
        delete spt;
    }
    return NULL;
}
int main()
{
    srand(time(NULL));
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        int t = rand() % 101 - 50;
        cout << t << " ";
        a = AddStask(a, t);
    }
    cout << endl;
    int t;
    while (a != NULL) {

        a = ReadStackD(a, t);
        b = AddStask(b, t);
    }
    b = ReadStackD(b, t);
    while (b != NULL) {
        b = ReadStackD(b, t);
        a = AddStask(a, t);
    }
    while (a != NULL) {
        a = ReadStackD(a, t);
        cout << t << " ";
    }
    DelStackAll(a);
    DelStackAll(b);

    return 0;
}