#include <iostream>

#include <set>

#include <vector>

#include <algorithm>

using namespace std;

int main(){

    int n,v;

    cin >> n >> v;

    vector<int> res;

    for(int i = ; i < n; ++ i){

        int k,s;

        bool flag = false;

        cin >> k;

        for(int j  = ; j < k; ++j){

            int s;

            cin >> s;

            if(!flag && s < v) res.push_back(i+),flag = true;

        }

    }

    cout<<res.size()<<endl;

    for(int i =  ; i < res.size(); ++ i){

        if(i)cout<<" ";

        cout<<res[i];

    }

    cout<<endl;

}