#include <bits/stdc++.h>
using namespace std;
const int MAX = 200020;
const long long MOD = (int)1e9 + 7;
const int INF = 1e9;
const long long LLINF = 0x3f3f3f3f3f3f3f3f;
const long double EPS = 1e-7;
void get_sub(string s, int size, set<string>& sub) {
  int n = s.size();
  for (int l = 0, r = size - 1; r < n; l++, r++) {
    string t = s.substr(l, size);
    sub.insert(t);
  }
}
set<string> merge(set<string> a, set<string> b) {
  set<string> res = a;
  for (auto s : b) {
    res.insert(s);
  }
  return res;
}
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ;
  int n, m;
  cin >> n;
  vector<string> pre(301, string()), suf(301, string());
  vector<vector<set<string>>> sub(301, vector<set<string>>(10, set<string>()));
  for (int i = 1; i <= n; i++) {
    string s;
    cin >> s;
    int sz = s.size();
    pre[i] = s.substr(0, min(9, sz));
    suf[i] = s.substr(max(0, sz - 9), min(9, sz));
    for (int k = 1; k <= 9; k++) {
      get_sub(s, k, sub[i][k]);
    }
  }
  cin >> m;
  for (int i = 1; i <= m; i++) {
    int a, b;
    cin >> a >> b;
    string t = suf[a] + pre[b];
    int sz = t.size();
    string p = pre[a] + pre[b];
    sz = p.size();
    pre[n + i] = p.substr(0, min(9, sz));
    string s = suf[a] + suf[b];
    sz = s.size();
    suf[n + i] = s.substr(max(0, sz - 9), min(9, sz));
    for (int k = 1; k <= 9; k++) {
      sub[n + i][k] = merge(sub[a][k], sub[b][k]);
      get_sub(t, k, sub[n + i][k]);
    }
    int res = 0;
    for (int k = 1; k <= 9; k++) {
      if ((int)sub[n + i][k].size() == (1 << k)) res = k;
    }
    cout << res << '\n';
  }
  return 0;
}
