#include <iostream>
#include <stdio.h>
#include <cstring>
#include <string>
using namespace std;

char sh[50005][20];

struct node
{
    bool flag;
    node *next[26];
};

node *root, memory[5000005];
int cnt = 0;

node *create()
{
    node *p = &memory[cnt++];
    int i;
    for(i = 0; i < 26; i++)
    {
        p->next[i] = NULL;
    }
    p->flag = false;
    return p;
}

void insert(char *s)
{
    node *p = root;
    int i, k;
    for(i = 0; s[i]; i++)
    {
        k = s[i] - 'a';
        if(p->next[k] == NULL)
        {
            p->next[k] = create();
        }
        p = p->next[k];
    }
    p->flag = true;
}

bool search(char *s)
{
    int i, j, k;
    bool tar;
    for(i = 0; s[i]; i++)
    {
        node *p = root;
        for(j = 0; j < i; j++)
        {
            k = s[j] - 'a';
            p = p->next[k];
        }
        if(p->flag == 1)
        {
            node *q = root;
            tar = true;
            for(j = i; s[j]; j++)
            {
                k = s[j] - 'a';
                if(q->next[k] == NULL)
                {
                    tar = false;
                    break;
                }
                q = q->next[k];
            }
            if(q->flag == 1 && tar)
            {
                return true;
            }
        }
    }

    return false;
}

int main()
{
    int i, n;
    root = create();
    i = 0;
    while(scanf("%s", sh[i]) != EOF)
    {
        insert(sh[i]);
        i++;
    }
    n = i;
    for(i = 0; i < n; i++)
    {
        if(search(sh[i]))
        {
            printf("%s\n", sh[i]);
        }
    }

    return 0;
}