#include <bits/stdc++.h>
using namespace std;
long long int dp[(1LL << 24)];
bool checkbit(long long int mask, long long int i) {
  return (mask & (1LL << i));
}
long long int setbit(long long int mask, long long int i) {
  return mask | (1LL << i);
}
long long int unsetbit(long long int mask, long long int i) {
  return mask ^ (1LL << i);
}
int main() {
  long long int n;
  char buff[5];
  scanf("%lld", &n);
  for (long long int i = 0; i < n; i++) {
    scanf(" %s", buff);
    long long int mask = 0;
    for (long long int j = 0; j < 3; j++) {
      char ch = buff[j];
      mask = setbit(mask, ch - 'a');
    }
    dp[mask]++;
  }
  for (long long int i = 0; i < 24; i++) {
    for (long long int mask = 0; mask < (1LL << 24); mask++) {
      if (checkbit(mask, i)) {
        dp[mask] += dp[unsetbit(mask, i)];
      }
    }
  }
  long long int ans = 0;
  for (long long int mask = 0; mask < (1LL << 24); mask++) {
    long long int inverse_mask = ((1LL << 24) - 1) ^ mask;
    long long int cnt = n - dp[inverse_mask];
    cnt = cnt * cnt;
    ans = ans ^ cnt;
  }
  printf("%lld\n", ans);
}
