#include <bits/stdc++.h>
using namespace std;
const int inf = 0x3f3f3f3f;
const long long INF = 0x3f3f3f3f3f3f3f3f;
int n;
int a[300005];
bool ff(char c, char b) { return (int)b - (int)c == 1; }
int main() {
  ios::sync_with_stdio(false);
  cin >> n;
  string s;
  while (n--) {
    cin >> s;
    int len = s.size();
    if (len == 1) {
      cout << "Yes" << endl;
      continue;
    }
    bool ok1 = 1;
    bool ok2 = 1;
    bool vis[30];
    memset(vis, 0, sizeof(vis));
    for (int i = 0; i < len; i++) {
      if (vis[s[i] - 'a']) ok2 = 0;
      vis[s[i] - 'a'] = 1;
    }
    if (!ok2) {
      cout << "no" << endl;
      continue;
    }
    vector<int> v;
    v.clear();
    for (int i = 0; i < 26; i++) {
      if (vis[i]) v.push_back(i);
    }
    sort(v.begin(), v.end());
    for (int i = 0; i < v.size(); i++) {
      if (i + 1 < v.size() && v[i + 1] - v[i] > 1) ok1 = 0;
    }
    if (ok1)
      cout << "yes" << endl;
    else
      cout << "no" << endl;
  }
  return 0;
}
