#include "testlib.h"
#include <iostream>
#include <cassert>

const int MIN_N = 1;
const int MAX_N = 200000;

const int MIN_K = 1;
const int MAX_K = 1;

const int MIN_A = 1;
const int MAX_A = 1000000000;

const int SUM_M = 100000;

int main(int argc, char** argv) {
    registerValidation(argc, argv);
    const int n = inf.readInt(MIN_N, MAX_N);
    inf.readSpace();
    const int k = inf.readInt(MIN_K, MAX_K);
    inf.readEoln();
    int sum_m = 0;
    for (int i = 1; i <= n; ++i) {
        inf.readInt(MIN_A, MAX_A);
        inf.readSpace();
        const int m = inf.readInt(0, i - 1);
        sum_m += m;
        assert(sum_m <= SUM_M);
        inf.readEoln();
        
        int pre = 0;
        for (int j = 0; j < m; ++j) {
            const int b = inf.readInt(pre + 1, i);
            pre = b;
            if (j + 1 < m) {
                inf.readSpace();
            }
        }
        inf.readEoln();
    }
    inf.readEof();
    return 0;
}