#include <cstdio>
#include <queue>
#define in "interclasari.in"
#define out "interclasari.out"

using namespace std;

priority_queue<int> q;

int n,x,cnt;
short K;

int main()
{
    freopen(in,"r",stdin);
    freopen(out,"w",stdout);

    scanf("%hd",&K);

    while(K--)
    {
        scanf("%d",&n);
        cnt += n;

       while(n--)
        {
            scanf("%d",&x);
            q.push(-x);
        }
    }

    printf("%d\n",cnt);
    while(!q.empty())
    {
        printf("%d ",-q.top());
        q.pop();
    }
    return 0;
}