#include <bits/stdc++.h>
#define ll long long
#define INF 1000000005
#define MOD 1000000007
#define EPS 1e-10
#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define rrep(i,n) for(int i=(int)(n)-1;i>=0;--i)
#define srep(i,s,t) for(int i=(int)(s);i<(int)(t);++i)
#define each(a,b) for(auto& (a): (b))
#define all(v) (v).begin(),(v).end()
#define len(v) (int)(v).size()
#define zip(v) sort(all(v)),v.erase(unique(all(v)),v.end())
#define cmx(x,y) x=max(x,y)
#define cmn(x,y) x=min(x,y)
#define fi first
#define se second
#define pb push_back
#define show(x) cout<<#x<<" = "<<(x)<<endl
#define spair(p) cout<<#p<<": "<<p.fi<<" "<<p.se<<endl
#define sar(a,n) cout<<#a<<":";rep(pachico,n)cout<<" "<<a[pachico];cout<<endl
#define svec(v) cout<<#v<<":";rep(pachico,v.size())cout<<" "<<v[pachico];cout<<endl
#define svecp(v) cout<<#v<<":";each(pachico,v)cout<<" {"<<pachico.first<<":"<<pachico.second<<"}";cout<<endl
#define sset(s) cout<<#s<<":";each(pachico,s)cout<<" "<<pachico;cout<<endl
#define smap(m) cout<<#m<<":";each(pachico,m)cout<<" {"<<pachico.first<<":"<<pachico.second<<"}";cout<<endl

using namespace std;

typedef pair<int,int> P;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<double> vd;
typedef vector<P> vp;
typedef vector<string> vs;

const int MAX_N = 100005;

template<typename V> class segtree{
private:
    int n,sz; vector<V> node; vector<int> node_id;
public:
    void resize(vector<V> v){
        sz = (int)v.size(); n = 1;
        while(n < sz) n *= 2;
        node.resize(2*n-1),node_id.resize(2*n-1);
        rep(i,sz){
            node[i+n-1] = v[i];
            node_id[i+n-1] = i;
        }
        for(int i=n-2; i>=0; i--){
            if(node[2*i+1] > node[2*i+2]){
                node[i] = node[2*i+2];
                node_id[i] = node_id[2*i+2];
            }else{
                node[i] = node[2*i+1];
                node_id[i] = node_id[2*i+1];
            }
        }
    }
    void update(int k,int a){
    	k += n-1;
    	node[k] = a,node_id[k] = k-(n-1);
    	while(k>0){
    		k = (k-1)/2;
    		if(node[2*k+1] < node[2*k+2]){
                node[k] = node[2*k+1],node_id[k] = node_id[2*k+1];
            }else{
                node[k] = node[2*k+2],node_id[k] = node_id[2*k+2];
            }
    	}
    }
    pair<V,int> query(int a,int b,int k=0,int l=0,int r=-1){
        if(r < 0) r = n;
    	if(r <= a || b <= l) return pair<V,int>(INT_MAX,-1);
    	if(a <= l && r <= b){
    		return pair<V,int>(node[k],node_id[k]);
    	}else{
    		pair<V,int> vl = query(a,b,2*k+1,l,(l+r)/2);
    		pair<V,int> vr = query(a,b,2*k+2,(l+r)/2,r);
    		return min(vl,vr);
    	}
    }
    void print(){
        rep(i,sz){
            pair<V,int> p;
            p = query(i,i+1);
            cout << "st[" << i << "]: " << p.fi << " " << p.se << endl;
        }
    }
};

class LCA{
public:
    vector<int> ord,depth,id;
    vector<vector<int> > G;
    segtree<int> st;
    int V;
    LCA(int node_size){
        V = node_size;
        G.resize(V),depth.resize(V),id.resize(V,-1);
    }
    void add_edge(int from,int to){
        G[from].push_back(to),G[to].push_back(from);
    }
    void dfs(int u,int p,int k){
        id[u] = (int)ord.size();
        ord.push_back(u);
        depth[u] = k;
        rep(i,G[u].size()){
            if(G[u][i] != p){
                dfs(G[u][i],u,k+1);
                ord.push_back(u);
            }
        }
    }
    void build(){
        rep(i,V){
            if(id[i] < 0){
                dfs(i,-1,0);
            }
        }
        vector<int> stvec((int)ord.size());
    	rep(i,ord.size()){
    		stvec[i] = depth[ord[i]];
    	}
        st.resize(stvec);
    }
    int solve(int u,int v){
        return ord[st.query(min(id[u],id[v]),max(id[u],id[v])+1).second];
    }
    int dist(int u,int v){
        int lca = solve(u,v);
        return depth[u] + depth[v] - 2*depth[lca];
    }
};

vector<int> G[MAX_N];

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
	LCA lca(n);
	rep(i,n){
		int cnt;
		cin >> cnt;
		rep(j,cnt){
			int a;
			cin >> a;
			lca.add_edge(i,a);
		}
	}
	lca.build();
	int q;
	cin >> q;
	rep(i,q){
		int a,b;
		cin >> a >> b;
		cout << lca.solve(a,b) << "\n";
	}
    return 0;
}



Measured memory_bytes: 20296