#include <bits/stdc++.h>
using namespace std;
void solve() {
  string s;
  cin >> s;
  vector<long long> cnt(26);
  long long posl = 1e9, posr = 0;
  for (auto c : s) {
    cnt[c - 'a']++;
    posl = min(posl, (long long)(c - 'a'));
    posr = max(posr, (long long)(c - 'a'));
  }
  for (long long i = posl; i <= posr; i++) {
    if (cnt[i] != 1) {
      cout << "No\n";
      return;
    }
  }
  cout << "Yes\n";
}
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  cout << fixed;
  cout.precision(30);
  long long t = 1;
  cin >> t;
  while (t--) solve();
}
