#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<string>
#include<queue>
#include<algorithm>
#include<map>
#include<iomanip>
#define INF 99999999
using namespace std;
const int MAX=100000+10;
int s[MAX],num[MAX],pos[MAX];
int mark[MAX];
int main(){
    int n,m,q,a;
    while(cin>>n>>m,n+m){
        memset(mark,0,sizeof mark);
        memset(pos,-1,sizeof pos);
        for(int i=0;i<n;++i){
            scanf("%d",&s[i]);
            if(pos[s[i]] == -1)pos[s[i]]=i;
        }
        s[n]=n;
        for(int i=1;i<=m;++i){
            scanf("%d",&q);
            int l=n,r=-1,maxlen=INF;
            for(int j=0;j<q;++j){
                scanf("%d",&a);
                num[a]=0;
                mark[a]=i;
                if(pos[a]>r)r=pos[a];
                if(pos[a]<l)l=pos[a];
            }
            for(int j=l;j<=r;++j)++num[s[j]];
            maxlen=r-l+1;
            while(r<n){
                --num[s[l]];
                if(num[s[l]] == 0){
                    while(++r<n && s[r] != s[l])++num[s[r]];
                    num[s[r]]=1;
                }
                while(++l<=r && mark[s[l]] != i);
                if(r<n && maxlen>r-l+1)maxlen=r-l+1;
            }
            cout<<maxlen<<endl;
        }
    }
    return 0;
}