#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    if (!(cin>>n)) return 0;
    vector<vector<int>> matrix(n, vector<int>(n));
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            cin >> matrix[i][j];
        }
    }
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j <= i; ++j) {
            if (j == 0) {
                cout << matrix[i][j];
            } else {
                cout << " " << matrix[i][j];
            }
        }
        cout << endl;
    }
    return 0;
}