#include <bits/stdc++.h>
using namespace std;
short bit[21][205][20005], len[205], idd;
string ls[205], rs[205], s[205];
void cross(string b) {
  string a = b;
  reverse(a.begin(), a.end());
  for (int j = 0; j < a.size(); j++) {
    int val = 0;
    for (int k = j; k < a.size() && k < j + 20; k++) {
      if (a[k] == '1') val |= ((1ll << ((k - j))));
      if (val >= 2e4) break;
      bit[k - j + 1][idd][val] = 1;
    }
  }
}
int32_t main() {
  cin.tie(0);
  cout.tie(0);
  ios_base::sync_with_stdio(0);
  int n;
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> s[i];
    idd = i;
    len[i] = s[i].size();
    if (s[i].size() >= 20) {
      ls[i] = s[i].substr(0, 20);
      rs[i] = s[i].substr(s[i].size() - 20, 20);
    } else {
      ls[i] = s[i];
      rs[i] = s[i];
    }
    cross(s[i]);
  }
  int m;
  cin >> m;
  for (int i = n + 1; i <= n + m; i++) {
    int l, r;
    cin >> l >> r;
    idd = i;
    len[i] = len[r] + len[l];
    if (len[i] > 20) len[i] = 20;
    for (int k = 1; k <= 20; k++)
      for (int j = 0; j <= 1e4 && j < (1ll << (k)); j++)
        bit[k][i][j] = bit[k][l][j] | bit[k][r][j];
    if (len[l] < 20 && len[r] < 20) {
      s[i] = ls[l] + rs[r];
      len[i] = len[l] + len[r];
      if (s[i].size() >= 20) {
        ls[i] = s[i].substr(0, 20);
        rs[i] = s[i].substr(s[i].size() - 20, 20);
      } else {
        ls[i] = s[i];
        rs[i] = s[i];
      }
      cross(s[i]);
    } else if (len[l] < 20 && len[r] > 19) {
      s[i] = rs[l] + ls[r];
      rs[i] = rs[r];
      ls[i] = s[i].substr(0, 20);
      cross(s[i]);
    } else if (len[i] > 19 && len[r] < 20) {
      s[i] = rs[l] + ls[r];
      ls[i] = ls[l];
      rs[i] = s[i].substr(s[i].size() - 20, 20);
      cross(s[i]);
    } else {
      s[i] = rs[l] + ls[r];
      ls[i] = ls[l];
      rs[i] = rs[r];
      cross(s[i]);
    }
    int id = 0;
    for (int k = 1; k <= 20; k++)
      for (int j = 0; j <= 2e4 && j < (1ll << (k)); j++) {
        if (bit[k][i][j] == 0) break;
        if (j == ((1ll << (k))) - 1) id = k;
      }
    cout << id << "\n";
  }
}
