#include <iostream>
#include <vector>

using namespace std;

void print_vector(vector<int> v)
{
    for (int i = 0; i < v.size(); i++)
    {
        cout << v[i] << " ";
    }
    cout << endl;
}


int main(int argc, const char * argv[]) {
    int n, x;
    cin >> n;
    vector<int> v;
    for (int i = 0; i < n; i++)
    {
        cin >> x;
        v.push_back(x);
        print_vector(v);
    }
    return 0;
}