#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, i, x, m = 0;
  char a[1000];
  int s[26];
  cin >> n;
  while (n--) {
    cin >> a;
    m = 0;
    int mi = 1000, mx = -1;
    for (i = 0; i < 26; i++) {
      s[i] = 0;
    }
    x = strlen(a);
    for (i = 0; i < x; i++) {
      s[a[i] - 'a']++;
      mi = min(mi, (a[i] - 'a'));
      mx = max(mx, (a[i] - 'a'));
    }
    for (i = 0; i < 26; i++) {
      if (s[i] > 1) {
        cout << "No" << endl;
        m = 1;
        break;
      }
    }
    for (i = mi; i <= mx; i++) {
      if (s[i] != 1 && m != 1) {
        cout << "No" << endl;
        m = 1;
        break;
      }
    }
    if (m == 0) cout << "Yes" << endl;
  }
}
