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

#define rep(i,x,y) for(int i=(x);i<(y);++i)
#define debug(x) #x << "=" << (x)

#ifdef DEBUG
#define _GLIBCXX_DEBUG
#define show(x) std::cerr << debug(x) << " (L:" << __LINE__ << ")" << std::endl
#else
#define show(x)
#endif

typedef long long int ll;
typedef pair<int,int> pii;
template<typename T> using vec=std::vector<T>;

const int inf=1<<30;
const long long int infll=1LL<<62;
const double eps=1e-9;
const int dx[]={1,0,-1,0},dy[]={0,1,0,-1};

template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec){
    os << "[";
    for (const auto &v : vec) {
    	os << v << ",";
    }
    os << "]";
    return os;
}

class lca_solver{
	public:
    vector<vector<int>> children;
    int root;
    // if root,parent is -1.
    vector<int> parent;
    vector<int> depth;

    vector<vector<int>> parent_pow2;

    lca_solver(vector<vector<int>> &children_,int root_)
        : children(children_),root(root_){
        calc_parent_and_depth();
        calc_parent_pow2();
    };

    int lca(int u,int v){
        // make sure depth(u) > depth(v).
        if(depth[u] < depth[v]) swap(u,v);
        for(size_t k=0;k<parent_pow2.size();k++){
            if(((depth[u] - depth[v]) >> k) & 1){
                u = parent_pow2[k][u];
            }
        }

        if(u == v) return u;
        for(int k=(int)parent_pow2.size()-1;k>=0;k--){
            if(parent_pow2[k][u] != parent_pow2[k][v]){
                u = parent_pow2[k][u];
                v = parent_pow2[k][v];
            }
        }
        return parent_pow2[0][u];
    }

	private:
    void calc_parent_and_depth(){
        parent = vector<int>(children.size(),-1);
        depth = vector<int>(children.size(),-1);
        sub_calc_parent_and_depth(root,-1,0);
    }
    void sub_calc_parent_and_depth(int cur,int par,int dep){
        parent[cur] = par;
        depth[cur] = dep;
        for(int child : children[cur]){
            if(child != par){
                sub_calc_parent_and_depth(child,cur,dep+1);
            }
        }
    }
    void calc_parent_pow2(){
        // parent_pow2[k][i] = 2^k parent of node i.
        parent_pow2 = vector<vector<int>>(ceil(log(children.size())/log(2)+1),
                                          vector<int>(children.size(),-1));
        parent_pow2[0] = parent;
        for(size_t k=0;k+1<parent_pow2.size();k++){
            for(size_t v=0;v<children.size();v++){
                if(parent_pow2[k][v] >= 0){
                    parent_pow2[k+1][v] = parent_pow2[k][parent_pow2[k][v]];
                }
            }
        }
    }
};

void solve(){
    int n;
    cin >> n;
    vector<vector<int>> graph(n);
    rep(i,0,n){
        int k;
        cin >> k;
        rep(j,0,k){
            int c;
            cin >> c;
            graph[i].push_back(c);
        }
    }
    show("BBBBBB");
    lca_solver ls(graph,0);
    show("AAAAAAA");
    int q;
    cin >> q;
    rep(i,0,q){
        int u,v;
        cin >> u >> v;
        cout << ls.lca(u,v) << endl;
    }
}

int main(){
    std::cin.tie(0);
    std::ios::sync_with_stdio(false);
    cout.setf(ios::fixed);
    cout.precision(10);
    solve();
    return 0;
}

Measured memory_bytes: 25180