#include <bits/stdc++.h>
using namespace std;
const long long mod = 1000000007;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};
string Yes[2] = {"Yes", "No"};
const int inf = 1 << 29;
const long long INF = 1ll << 58ll;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int t;
  cin >> t;
  for (long long int tt = 0; tt < t; ++tt) {
    string s;
    cin >> s;
    int n = s.size();
    vector<int> sc(26, 0);
    for (long long int i = 0; i < n; ++i) {
      sc[s[i] - 'a']++;
    }
    int c = 0;
    bool ok = true;
    int i = 0;
    while (i < 26) {
      if (sc[i] == 1) {
        c++;
        while (i < 26 and sc[i] == 1) {
          i++;
        }
      } else if (sc[i] == 0)
        i++;
      else if (sc[i] > 1) {
        ok = false;
        break;
      }
    }
    if (ok and c == 1)
      cout << "Yes" << endl;
    else
      cout << "No" << endl;
  }
}
