// Slower C++ solution:
#include <iostream>

#include <cstdio>

#include <vector>

#include <complex>

#include <algorithm>

#include <set>

#include <map>

#include <queue>

#include <string>

#include <cstring>

#include <stack>

#include <cmath>

#include <iomanip>

#include <sstream>

#include <cassert>



using namespace std;



typedef long long ll;

typedef ll li;

typedef pair<int,int> PI;

#define EPS (1e-10L)

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

#define F first

#define S second

#define mp(a,b) make_pair(a,b)

#define pb(a) push_back(a)

#define SZ(a) (int)((a).size())

#define ALL(a) a.begin(),a.end()

#define FOR(it,a) for(__typeof(a.begin())it=a.begin();it!=a.end();++it)

void pkuassert(bool t){t=1/t;};



int dx[]={0,1,0,-1,1,1,-1,-1};

int dy[]={1,0,-1,0,-1,1,1,-1};



int N,M;



map<string,int> s2im;

int s2i(string a){

  if(s2im.count(a))

    return s2im[a];

  int sz=SZ(s2im);

  return s2im[a]=sz;

}



int in[200][200];

int g[200][200];



void solve(){

  rep(i,200)rep(j,200) g[i][j]=in[i][j]=9999+1;

  s2im.clear();

  rep(i,N) {

    string a,b;

    cin >> a;

    FOR(it,a) if(*it=='-') *it=' ';

    stringstream ss(a);

    ss >> a >> b;

    in[s2i(a)][s2i(b)]=1;

  }



  int n=SZ(s2im);

  rep(i,n)rep(j,n){

    bool ok=false;

    rep(k,n){

      if(in[i][k]==1 && in[j][k]==1) ok=true;

      if(in[i][k]==1 && in[k][j]==1) ok=true;

      if(in[k][i]==1 && in[j][k]==1) ok=true;

      if(in[k][i]==1 && in[k][j]==1) ok=true;

    }

    if(!ok) continue;

    ok=false;

    rep(k,n) if(in[k][i]==1 && in[j][k]==1) ok=true;

    if(ok) continue;

    rep(k,n) if(in[i][k]==1 && in[k][j]==1) ok=true;

    if(ok) continue;

    g[i][j]=g[j][i]=1;

  }

  

  rep(i,n)rep(j,n) g[i][j]=min(g[i][j],in[i][j]);

  rep(i,n)rep(j,n) if(in[i][j]==1) in[j][i]=1;





  

  rep(k,n)rep(i,n)rep(j,n){

    g[i][j]=min(g[i][j],g[i][k]+g[k][j]);

    in[i][j]=min(in[i][j],in[i][k]+in[k][j]);

  }

  



  cout << n << endl;

  cin >> M;

  rep(i, M){

    string a,b;

    cin >> a;

    FOR(it,a) if(*it=='-') *it=' ';

    stringstream ss(a);

    ss >> a >> b;

    int av=s2i(a);

    int bv=s2i(b);

    //cout << av << ' ' << bv << ' ' << g[av][bv] << ' ' << in[av][bv] << ' ' << in[bv][av] << endl;

    if(av<n && bv<n && g[av][bv]<9999 &&

       (in[av][bv]&1))cout << "YES" << endl;

    else cout << "NO" << endl;

  }

}



int main(int argc, char *argv[])

{

  while(cin >> N && N) solve();

  return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.19929643307216x):
#include <bits/stdc++.h>

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

#define F first

#define S second

#define pb push_back

#define mp make_pair

#define ALL(a) a.begin(), a.end()

#define SZ(a) ((int)(a).size())



using namespace std;

typedef long long ll;

typedef pair<int, int> PI;



int n;

map<string, int> memo;

vector<string> mstr;

int get(string a){

  if(memo.count(a))

    return memo[a];

  int sz = SZ(memo);

  mstr.pb(a);

  return memo[a] = sz;

}



vector<PI> G[2000];

int vis[2000];

int vcnt;

bool app[2000][2000];



vector<int> cG[2000];



void solve(){

  memo.clear();

  mstr.clear();

  rep(i, n*2) G[i].clear();

  rep(i, n*2) cG[i].clear();

  

  set<PI> input;

  rep(i, n){

    string a, b;

    cin >> a;

    a[a.find('-')] = ' ';

    stringstream ss(a);

    ss >> a >> b;

    int u = get(a);

    int v = get(b);

    G[u].pb(mp(v,1));

    cG[u].pb(v);

    cG[v].pb(u);

    input.insert(mp(u, v));

  }

  

  

  cout << SZ(memo) << endl;

  rep(i, SZ(memo)) rep(j, SZ(memo)) app[i][j] = 0;

  for(auto e : input) app[e.F][e.S] = 1;



  

  // rep(d, SZ(memo)){

  //   sort(ALL(cG[d]));

  //   cG[d].erase(unique(ALL(cG[d])), cG[d].end());



  //   for(auto a : cG[d]) for(auto b : cG[d]){

  //       if(a == b) break;

        

  //       if(app[a][d] && app[d][b]) continue;

  //       if(app[b][d] && app[d][a]) continue;

  //       G[a].pb(mp(b,0));

  //       G[b].pb(mp(a,0));

  //     }

  // }



  rep(i, SZ(memo)) rep(j, i){

    bool ok = false;

    rep(k, SZ(memo))

      if((app[i][k]|app[k][i]) && (app[k][j]|app[j][k])){

        ok = true;

        break;

      }

    if(!ok) continue;

    ok = true;

    rep(k, SZ(memo)) if(app[i][k] && app[k][j]) ok = false;

    rep(k, SZ(memo)) if(app[j][k] && app[k][i]) ok = false;

    if(ok){

      G[i].pb(mp(j,0));

      G[j].pb(mp(i,0));

    }

  }

  

  rep(d, SZ(memo)){

    sort(ALL(G[d]));

    G[d].erase(unique(ALL(G[d])), G[d].end());

  }

  

  // rep(d, SZ(memo)){

  //   cout << mstr[d] << ": ";

  //   for(auto e : G[d])

  //     cout << mstr[e.F] << ",";

  //   cout << endl;

  // }

  

  int q;

  cin >> q;

  rep(i, q){

    string a, b;

    cin >> a;

    a[a.find('-')] = ' ';

    stringstream ss(a);

    ss >> a >> b;

    

    if(!(memo.count(a) && memo.count(b))){

      cout << "NO" << endl;

      continue;

    }

    

    int u = get(a);

    int v = get(b);

    queue<PI> q;

    q.push(mp(u,0));

    

    bool ok = false;

    ++vcnt;

    while(!q.empty()){

      int cv = q.front().F;

      int cc = q.front().S;

      q.pop();

      if(cv == v){

        //cout << "cc " << cc << endl;

        ok = cc & 1;

        break;

      }

      

      if(vis[cv] == vcnt) continue;

      //cout << mstr[cv] << endl;

      vis[cv] = vcnt;

      for(auto e : G[cv])

        if(vis[e.F] != vcnt)

          q.push(mp(e.F, cc + e.S));

    }

    

    if(ok) cout << "YES" << endl;

    else cout << "NO" << endl;

  }

}



int main(int argc, char *argv[])

{

  while(cin >> n && n) solve();

  return 0;

}