Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	io := NewIo()
	defer io.Flush()

	for {
		N := io.NextInt()
		if N == 0 {
			break
		}
		set := make([]map[int]struct{}, N)
		for i := 0; i < N; i++ {
			set[i] = make(map[int]struct{})
			M := io.NextInt()
			for j := 0; j < M; j++ {
				p := io.NextInt()
				set[i][p] = struct{}{}
			}
		}
		K := io.NextInt()
		l := make([]int, K)
		for i := 0; i < K; i++ {
			l[i] = io.NextInt()
		}

		ans := 0
	FOR_OUTER:
		for i := 0; i < N; i++ {
			for j := 0; j < K; j++ {
				if _, f := set[i][l[j]]; f == false {
					continue FOR_OUTER
				}
			}
			switch ans {
			case 0:
				ans = i + 1
			default:
				ans = -1
			}
		}
		if ans > 0 {
			io.Println(ans)
		} else {
			io.Println(-1)
		}
	}
}

// I/O template
type Io struct {
	reader    *bufio.Reader
	writer    *bufio.Writer
	tokens    []string
	nextToken int
}

func NewIo() *Io {
	return &Io{
		reader: bufio.NewReader(os.Stdin),
		writer: bufio.NewWriter(os.Stdout),
	}
}

func (io *Io) Flush() {
	err := io.writer.Flush()
	if err != nil {
		panic(err)
	}
}

func (io *Io) NextLine() string {
	var buff []byte
	for {
		line, isPrefix, err := io.reader.ReadLine()
		if err != nil {
			panic(err)
		}
		buff = append(buff, line...)
		if !isPrefix {
			break
		}
	}
	return string(buff)
}

func (io *Io) Next() string {
	for io.nextToken >= len(io.tokens) {
		line := io.NextLine()
		io.tokens = strings.Fields(line)
		io.nextToken = 0
	}
	s := io.tokens[io.nextToken]
	io.nextToken++
	return s
}

func (io *Io) NextInt() int {
	i, err := strconv.Atoi(io.Next())
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) NextFloat() float64 {
	i, err := strconv.ParseFloat(io.Next(), 64)
	if err != nil {
		panic(err)
	}
	return i
}

func (io *Io) Println(a ...interface{}) {
	fmt.Fprintln(io.writer, a...)
}

func (io *Io) Printf(format string, a ...interface{}) {
	fmt.Fprintf(io.writer, format, a...)
}

func (io *Io) PrintIntSlice(a []int) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func (io *Io) PrintStringSlice(a []string) {
	b := []interface{}{}
	for _, x := range a {
		b = append(b, x)
	}
	io.Println(b...)
}

func Log(name string, value interface{}) {
	fmt.Fprintf(os.Stderr, "%s=%+v\n", name, value)
}

func ExampleIo() {
	io := NewIo()
	defer io.Flush()
	a := make([]int, 0, 3)
	a[0], a[1], a[2] = io.NextInt(), io.NextInt(), io.NextInt()
	io.Println(a)
	io.PrintIntSlice(a)
	Log("io", a)
}

C++: #include<iostream>
#include<string>
#include<cstdio>
#include<algorithm>
#include<stack>
#include<queue>
#include<vector>
#include<cmath>
#include<cstring>
#include<utility>
#include<set>
#include<stack>
#include<complex>
#define vi vector<int>
#define vvi vector<vector<int> >
#define ll long long int
#define vl vector<ll>
#define vvl vector<vector<ll>>
#define vb vector<bool>
#define vc vector<char>
#define vs vector<string>
#define ld long double
#define INF 1e9
#define EPS 0.0000000001
#define rep(i,n) for(int i=0;i<n;i++)
#define CC puts("-------ok--------");
#define all(in) in.begin(), in.end()
#define bv vector<bool>
using namespace std;
typedef pair<int, int>PI;
using namespace std;
#define MAX  999999
int main(){
    int n;
    while(cin>> n,n){
        vi array(1000,0); bool check = false; int ans = 0; int hoge = -INF;;
        vi num(1000,0); vi size(1000,0);
        vi z;
        vvi v(1000,vi(1000,0));
        rep(i,n){cin >> size[i]; rep(j,size[i])cin >> v[i][j];}
        int temp; cin>>temp; vi u(temp+1,0);
        rep(i,temp) cin >> u[i];
        rep(i,n){
            rep(j,v[i].size()){
                rep(k,temp){
                    if(v[i][j] == u[k]){array[i]++; num[u[k]]+=1;}
                }
            }
            if(hoge < array[i]){hoge = array[i];ans = i;}
        }
        //cout << ans <<"array value is :"<<hoge<< endl;
        /*judgement all element*/
        rep(i,size[ans]){
            if(v[ans][i]!= 0){
                //cout << v[ans][i]; cout << endl;
                //cout << num[v[ans][i]]; cout << endl;
                if(num[v[ans][i]] == 1){check = true;break;}
            }
        }
        if(check == true) cout << ans+1 << endl;
        else  cout << -1 << endl;
    }
}

C++: #include <bits/stdc++.h>
using namespace std;

#define fs first
#define sc second
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define pb emplace_back

using pii = pair<int, int>;
using vi = vector<int>;
using lint = long long;

const int inf = 1001001001;
const lint linf = 1001001001001001001ll;
const int mod = 1e9 + 7;
const int dx[]{0, 1, 0, -1, -1, -1, 1, 1}, dy[]{1, 0, -1, 0, -1, 1, -1, 1};

template<typename T> inline bool chmin(T &a, T b) { if (a > b) { a = b; } return a > b; }
template<typename T> inline bool chmax(T &a, T b) { if (a < b) { a = b; } return a < b; }
template<typename T> inline void print(const T &x, string s = "\n") { cout << x << s; }
template<typename T> inline void print(const vector<T> &v, string s = " ") 
{ rep(i, v.size()) cout << v[i] << (i + 1 == v.size() ? "\n" : s); }
inline bool inside(int y, int x, int H, int W) { return 0 <= y && y < H && 0 <= x && x < W; }
inline lint in() { lint x; std::cin>>x; return x; }

int main() {
	int n;
	
	while (cin >> n, n) {
		bool f[101][101] = {false};
		rep(i, n) {
			int m = in();
			rep(j, m) {
				f[i][in()] = true;
			}
		}

		vi a, l;
		
		int k = in();
		rep(i, k) l.pb(in());

		rep(i, n) {
			bool beet = true;
			rep(j, l.size()) {
				if (!f[i][l[j]]) beet = false;
			}
			if (beet) a.pb(i + 1);
		}

		cout << (a.size() == 1 ? a[0] : -1) << endl;
	}
}

C++: #include<iostream>
using namespace std;
int x[200][200],y[200],z[200],n,i,a,j,k,b,s,c;
int main(){
	while(true){
		cin>>n;b=0;
		if(!n){break;}
		for(i=1;i<=n;i++){
			cin>>z[i];
			for(j=0;j<z[i];j++){
				cin>>x[i][j];
			}
		}
		cin>>a;
		for(i=0;i<a;i++){cin>>y[i];}
		for(i=1;i<=n;i++){
			s=0;
			for(j=0;j<a;j++){
				for(k=0;k<z[i];k++){
					if(x[i][k]==y[j]){
						s++;
					}
				}
			}
			if(s==a){c=i;b++;}
		}
		if(b-1){c=-1;}
		cout<<c<<endl;
	}
}