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#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string.h>
using namespace std;
const int Max=120010;
char word[Max][100];
int search(char *str,int n)
{
    int left=0,right=n-1;
    while(left<=right)
    {
        int mid=(left+right)>>1;
        if(!strcmp(str,word[mid]))
         return 1;
        if(strcmp(str,word[mid])<0)
          right=mid-1;
        else
          left=mid+1;
    }
    return 0;
}
int main()
{
    int n=0;
    while(scanf("%s",word[n++])!=EOF);
    for(int i=0; i<n; i++)
    {
        int len=strlen(word[i]);
        char str[100],*str1;
        for(int j=0,k=0; j<len-1; j++)
        {
            str[k++]=word[i][j];
            str[k]='\0';
            str1=word[i]+j+1;
            if(search(str,n)&&search(str1,n))
            {
                printf("%s\n",word[i]);
                break;
            }
        }
    }
    return 0;
}