#include <iostream>
#include <stdlib.h>
#include <cstdlib>
#include <stdio.h>

using namespace std;

struct node_s {
	int val;
	node_s *next;

};

void print(node_s* list) {
	node_s* temp = list;
	while (temp != NULL) {
		cout << temp->val;
	}
}

int main() {
	int a;
	cin >> a;
	while(a != 0) {
		node_s *first = (node_s*)malloc(sizeof(struct node_s));
		node_s *last = first;
		first->next = NULL;
		first->val = a;
		last->next = (node_s*)malloc(sizeof(struct node_s));
		last = last->next;
		last->next = NULL;
	}
}