#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
  string s;
  cin >> s;
  vector<string> ans;
  if (s[0] == '.' || s.back() == '.') {
    cout << "NO\n";
    return 0;
  }
  int last_point = -2;
  for (int i = 0; i < s.size(); ++i) {
    if (s[i] == '.') {
      if (i > 0) {
        if (s[i - 1] == '.' || s[i + 1] == '.') {
          cout << "NO\n";
          return 0;
        }
        string s1;
        for (int j = i - 1; j > last_point + 1; --j) s1 += s[j];
        if (last_point + 1 == i - 1) {
          cout << "NO\n";
          return 0;
        }
        reverse(s1.begin(), s1.end());
        if (s1.size() > 10) {
          cout << "NO\n";
          return 0;
        }
        if (s1.size() > 8) {
          while (s1.size() > 8) {
            if (ans.size() == 0) {
              cout << "NO\n";
              return 0;
            }
            ans.back() += s1[0];
            s1.erase(0, 1);
          }
        }
        if (i + 1 < s.size()) ans.push_back(s1 + '.' + s[i + 1]);
        last_point = i;
        ++i;
      }
    }
  }
  if (last_point == -2) {
    cout << "NO\n";
    return 0;
  }
  if (s.size() - last_point - 1 > 3) {
    cout << "NO\n";
    return 0;
  }
  for (int i = last_point + 2; i < s.size(); ++i) ans.back() += s[i];
  cout << "YES\n";
  for (int i = 0; i < ans.size(); ++i) cout << ans[i] << '\n';
  return 0;
}
