#include <iostream>

using namespace std;

int main()
{
    int N;
    while(cin>>N)
    {
        string flush;
        getline(cin,flush);
        string arr [N];
        for(int i=0;i<N;i++)
        {
            getline(cin,arr[i]);
        }

        int ** colF = new int * [N];
        int ** rowF = new int * [N];
        int * overalF = new int [26];
        for(int i=0;i<N;i++)
        {
            rowF[i]=new int [26];
            colF[i]=new int [26];
            for(int j=0;j<26;j++)
            {
                colF[i][j]=0;
                rowF[i][j]=0;
                overalF[j]=0;
            }
        }

        for(int i=0;i<N;i++)
        {
            for(int j=0;j<N;j++)
            {
                char c=arr[i][j];
                rowF[i][c-'A']++;
                colF[j][c-'A']++;
                overalF[c-'A']++;
            }
        }

        int coJeNavic=-1;
        for(int i=0;i<26;i++)
        {
            if(overalF[i]==1)
            {
                coJeNavic=i;
                break;
            }
        }


      /*  cout<<"Col:"<<endl;
         for(int i=0;i<N;i++)
        {
            for(int j=0;j<26;j++)
            {
                cout<<colF[i][j]<<" ";
            }
            cout<<endl;
        }
        cout<<"Overal:"<<endl;
        for(int j=0;j<26;j++)
        {
            cout<<overalF[j]<<" ";
        }
        cout<<endl;*/


        if(coJeNavic!=-1)
        {
            for(int i=0;i<N;i++)
            {
                if(rowF[i][coJeNavic]==1)
                {
                    cout<<i+1<<" ";
                    break;
                }
            }
            int colI;
            for(int i=0;i<N;i++)
            {
                if(colF[i][coJeNavic]==1)
                {
                    cout<<i+1<<" ";
                    colI=i;
                    break;
                }
            }

            //int * tmpF = new int [26];
            for(int i=0;i<26;i++)
            {
                if(colF[colI][i]==0 && overalF[i]>0)
                {
                    cout<<(char)('A'+i)<<endl;
                }
            }
            continue;
        }

        int navic;
        int tmc=0;
        for(int i=0;i<26;i++)
        {
            if(overalF[i]>tmc)
            {
                tmc=overalF[i];
                navic=i;
            }
        }

        for(int i=0;i<N;i++)
        {
            if(rowF[i][navic]==2)
            {
                cout<<i+1<<" ";
                break;
            }
        }
        int colI;
        for(int i=0;i<N;i++)
        {
            if(colF[i][navic]==2)
            {
                cout<<i+1<<" ";
                colI=i;
                break;
            }
        }

        //int * tmpF = new int [26];
        for(int i=0;i<26;i++)
        {
            if(colF[colI][i]==0 && overalF[i]>0)
            {
                cout<<(char)('A'+i)<<endl;
            }
        }


    }
    return 0;
}