#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    cin>>n;
    vector<vector<int>> v;
    for(int i=0;i<n;i++){
        vector<int> v1;
        for(int j=0;j<n;j++){
            int x;
            cin>>x;
            v1.push_back(x);
        }
        v.push_back(v1);
    }
    
    cout<<v[0].size()<<endl;
    cout<<"a"<<endl;
    return 0;
}