#include <cstdio>
#include <queue>
using namespace std;

priority_queue < int > Q;

int main()
{

    freopen("interclasari.in","r",stdin);
    freopen("interclasari.out","w",stdout);

    int n, m, i, j, k, s, t, d;
    s = 0;

    scanf("%d",&m);
    while( m-- ){
        scanf("%d",&n);
        for( i = 1; i <= n; ++i ){
            scanf("%d",&d);
            Q.push( -d );
        }
        s += n;
    }


    printf("%d\n",s);
    while( !Q.empty() ){
        printf("%d ",-Q.top());
        Q.pop();
    }

    return 0;

}