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 <vector>
#include <map>
using namespace std;

#define rep(i,n) for(int i=0;i<n;++i)

int main(){
	int n;
	while(cin>>n,n){
		vector<map<int,int> > v(n);
		// cout<<-1<<endl;
		rep(i,n){
			int m;
			cin>>m;
			rep(j,m){
				int t;
				cin>>t;
				v[i][t]=1;
			}
		}
		int r;
		cin>>r;
		// cout<<r<<endl;
		vector<int> s(r);
		rep(i,r){
			cin>>s[i];
		}
		int ans=0;
		bool f2=false;

		rep(i,n){
			bool f=true;
			rep(j,s.size()){
				if(v[i][s[j]]==1);
				else{
					f=false;
					// cout<<"hoge\n";
					break;
				}
			}
			if(f){
				if(ans==0){
					ans=i+1;
				}
				else{
					f2=true;
					break;
				}
			}
		}
		if(f2||ans==0) cout<<-1<<endl;
		else cout<<ans<<endl;
	}
	return 0;
}

C++: #include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;

int graf[114][114];

int main() {
	int n;
	while (cin >> n, n) {
		for (int i = 0; i < 100; i++)
			for (int j = 0; j < 100; j++)graf[i][j] = 0;

		for (int i = 0; i < n; i++) {
			int m;
			cin >> m;
			for (int j = 0; j < m; j++) {
				int a;
				cin >> a;
				graf[i][a-1]=1;
			}
		}

		int k[103];
		int b;
		cin >> b;
		for (int i = 0; i < b; i++)cin >> k[i];

		vector<int>v;
		for (int i = 0; i < n; i++) {
			int flg = 0;
			for (int j = 0; j < b; j++) {
				if (!graf[i][k[j]-1])flg = 1;
			}
			if (flg == 0)v.push_back(i);
		}
		if (v.size() == 1)cout << v[0] +1<< endl;
		else cout << -1 << endl;
	}
	return 0;
}