#include <iostream>
#include <string>

using namespace std;

bool cmp(int feq1[26], int feq2[26])
{
    for (int i = 0; i < 26; ++i)
    {
        if (feq1[i] != feq2[i])
        {
            return false;
        }
    }
    return true;
}

int main()
{
    int N;
    cin >> N;
    int word_feq[N][26] = {0}, col_feq[N][26] = {0};
    string S[N];
    for (int i = 0; i < N; ++i)
    {
        cin >> S[i];
        for (size_t l = 0; l < S[i].length(); ++l)
        {
            word_feq[i][S[i][l] - 'a']++;
            if (l < N)
            {
                col_feq[l][S[i][l] - 'a']++;
            }
        }
    }

    for (int i = 0; i < N; ++i)
    {
        for (int j = 0; j < N; ++j)
        {
            if (cmp(word_feq[i], col_feq[j]))
            {
                cout << S[i] << endl;
            }
        }
    }
}