#include <bits/stdc++.h>
using namespace std;
const int MAXB = 24;
const int ALL = (1 << MAXB) - 1;
int subtract(int bm, int b) { return bm & ~(1 << b); }
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  vector<int> score(1 << MAXB);
  for (int i = 0; i < (int)n; i++) {
    string s;
    cin >> s;
    sort(s.begin(), s.end());
    s.resize(unique(s.begin(), s.end()) - s.begin());
    for (int i = 0; i < (int)s.size(); i++) s[i] -= 'a';
    score[ALL]++;
    if (s.size() == 1) {
      score[subtract(ALL, s[0])]--;
    } else if (s.size() == 2) {
      score[subtract(ALL, s[0])]--;
      score[subtract(ALL, s[1])]--;
      score[subtract(subtract(ALL, s[0]), s[1])]++;
    } else {
      score[subtract(ALL, s[0])]--;
      score[subtract(ALL, s[1])]--;
      score[subtract(ALL, s[2])]--;
      score[subtract(subtract(ALL, s[0]), s[1])]++;
      score[subtract(subtract(ALL, s[0]), s[2])]++;
      score[subtract(subtract(ALL, s[1]), s[2])]++;
      score[subtract(subtract(subtract(ALL, s[0]), s[1]), s[2])]--;
    }
  }
  for (int i = 0; i < MAXB; i++)
    for (int bm = 0; bm < (int)1 << MAXB; bm++) {
      if (bm & 1 << i) score[bm ^ 1 << i] += score[bm];
    }
  int ans = 0;
  for (int x : score) ans ^= (n - x) * (n - x);
  cout << ans << "\n";
}
