#include <bits/stdc++.h>
using namespace std;
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int m;
    cin>>m;
    int graph[m+1][m+1];
    vector<int> res[m+1];
    for(int i = 0; i < m; i++){
        for(int j = 1; j <= m; j++){
            cin>>graph[i][j];
            if(graph[i][j] == 1){
                res[i].push_back(j);
            }
        }
    }
    for(int l = 0; l < m; l++){
        cout<<res[l].size()<<" ";
        for(auto x : res[l]){
            cout<<x<<" ";
        }
        cout<<endl;
    }
    return 0;
}

C++ solution using graphs