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++: //
//  main.cpp
//  c
//
//  Created by 13B10694 on 2015/06/01.
//  Copyright (c) 2015???´ 13B10694. All rights reserved.
//

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

vector< vector<int> > vec;
vector<int> vect;
int main(int argc, const char * argv[]) {
    freopen ("/Users/shitian/Downloads/2399-in2.txt","r",stdin);
    int n, in, m, k;
    while(cin>>n,n){
        vec.clear();
        vect.clear();
        for(int i=0;i<n;i++){
            cin>>m;
            vector<int> tem;
            for(int j=0;j<m;j++){
                cin>>in;
                tem.push_back(in);
            }
            sort(tem.begin(),tem.end());
            vec.push_back(tem);
        }
        cin>>k;
        for(int i=0;i<k;i++){
            cin>>in;
            vect.push_back(in);
        }
        sort(vect.begin(),vect.end());
        int suc=0,po=-1;
        for(int i=0;i<vec.size();i++){
            
            if(vec[i].empty() && !vect.empty())continue;
            int now=0;
            int j;int out =0,count=0;
            for(j=0;j<vect.size();j++){
                
                while(vect[j]>vec[i][now]){
                    now++;
                    if(now >= (int)vec[i].size()){
                        out=1;
                        break;
                    }
                }
                
                if(vect[j]<vec[i][now]||out==1)
                    break;
                if(vect[j]==vec[i][now]){
                    now++;count++;
                }
            }
            if(out==1){continue;}
            
            
            // if(vect[vect.size()-1]==vec[i][now-1]&&count==(int)vect.size()){
            if((int)vect.size() == count) {
                suc++;
                po = i+1;
//                cout<<"out: "<<out<<endl;
//                      cout << "=======" << i << endl;
//                      cout<<out<<endl;
//                      for(int j=0; j<vec[i].size(); j++) cout << vec[i][j] << " ";
//                      cout << endl;
//                      for(int j=0; j<vect.size(); j++) cout << vect[j] << " ";
//                      cout << endl;
//                
            }
        }
        if(suc==1){
            cout<<po<<endl;
        }
        else{
            cout << -1<<endl;
        }
        
    }
    
    return 0;
}

C++: #include <stdio.h>
#include <stdlib.h>
#include <limits.h>

int main()
{
    while(1)
    {
        int N;
        scanf("%d", &N);
        if(N == 0) return 0;

        int **a;
        a = (int **)malloc(sizeof(int *)*N);
        for(int i = 0; i < N; i++)
        {
            a[i] = (int *)malloc(sizeof(int)*N);
            for(int j = 0; j < N; j++)
            {
                a[i][j] = 0;
            }
        }

        for(int i = 0; i < N; i++)
        {
            int M;
            scanf("%d", &M);
            for(int j = 0; j < M; j++)
            {
                int temp;
                scanf("%d", &temp);
                a[i][temp-1] = 1;
            }
        }

        int *c, L;
        scanf("%d", &L);
        c = (int *)malloc(sizeof(int)*L);
        for(int j = 0; j < L; j++)
        {
            c[j] = -1;
        }

        for(int i = 0; i < L; i++)
        {
            int d;
            scanf("%d", &d);
            c[i] = d-1;
        }

        int b = -1;
        for(int i = 0; i < N; i++)
        {
            int t = 0;
            for(int j = 0; j < L; j++)
            {
                if(a[i][c[j]] == 0) t++;
            }
            if(t == 0 && b == -1) b = i;
            else if(t == 0 && b != -1) b = -2;
        }
        if(b < 0) printf("-1\n");
        else printf("%d\n", b+1);
    }
}

C++: #include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)

main(){
    while(1){
        int n;cin>>n;
        if(!n)exit(0);
        vector<set<int>> v;
        rep(i,n){
            int m;cin>>m;
            v.push_back(set<int>());
            rep(_,m){
                int x;cin>>x;
                v.back().insert(x);
            }
        }
        int k;cin>>k;
        set<int> s;
        rep(i,k){
            int x;cin>>x;
            s.insert(x);
        }
        bool flag=false;int pre;
        rep(i,n){
            bool f=true;
            for(auto e:s){
                f&=(v[i].count(e)>0);
            }
            if(f){
                if(flag){
                    cout<<-1<<endl;
                    goto end;
                }
                else{
                    flag = true;
                    pre = i+1;
                }
            }
        }
        if(flag){
            cout<<pre<<endl;
        }
        else cout<<-1<<endl;
        end:;
    }
}

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

int main(){
  int n;
  while(cin>>n,n){
    vector<set<int> > vec(n+1);
    for(int i=0;i<=n;i++){
      int m;
      cin>>m;
      for(int j=0;j<m;j++){
	int t;
	cin>>t;
	vec[i].insert(t);
      }
    }

    int cnt=0;
    int temp=0;
    for(int i=0;i<n;i++){
      if(includes(vec[i].begin(),vec[i].end(),vec[n].begin(),vec[n].end())){
	cnt++;
	temp=i+1;
      }
    }
    if(cnt != 1)
      cout<<-1<<endl;
    else
      cout<<temp<<endl;

  }
  return 0;
}