#include<iostream>
using namespace std;
int main()
{
    int n,k,a[11][22],p[11],l=0,h[22]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    cin>>n>>k;
    for(int i=0;i<n;i++)
    {
            cin>>p[i];
            if(p[i]==k){cout<<"1"<<endl<<i+1<<endl;l=1;break;}
            for(int j=0;j<p[i];j++)
            {
                    cin>>a[i][j];
                    h[a[i][j]]++;
            }
    }
    return 0;
}
            

