#include <bits/stdc++.h>
using namespace std;
long long int mod = 1e9 + 7;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  string s;
  cin >> s;
  vector<int> vect;
  vect.push_back(0);
  int i = 1;
  int n = s.length();
  int cnt = 0;
  int len = n + 1;
  string ans = "";
  for (int i = 1; i <= n; i++) {
    if (s[i - 1] == '.') {
      len = i;
      break;
    } else {
      ans += s[i - 1];
      cnt++;
    }
  }
  int back = 0;
  string t = "";
  int r = 0;
  for (int i = n; i >= 0; i--) {
    if (s[i - 1] == '.') {
      back = i;
      break;
    } else {
      t += s[i - 1];
      r++;
    }
  }
  if (len > back)
    cout << "NO";
  else if (cnt > 8 || r > 3)
    cout << "NO";
  else if (cnt == 0 || r == 0)
    cout << "NO";
  else {
    vector<string> result;
    int i = len;
    bool is = 1;
    while (i < back) {
      int j = i + 1;
      int cnt = 0;
      while (j <= n) {
        if (s[j - 1] != '.') {
          cnt++;
          j++;
        } else
          break;
      }
      if (cnt < 2 || cnt > 11) {
        is = 0;
        break;
      }
      j = i + 1;
      ans += '.';
      int r = 3;
      if (cnt <= 3) r = 1;
      while (j <= i + r) {
        ans += s[j - 1];
        j++;
      }
      result.push_back(ans);
      string t = "";
      while (j <= n) {
        if (s[j - 1] != '.') {
          t += s[j - 1];
          j++;
        } else
          break;
      }
      ans = t;
      i = j;
    }
    if (!is)
      cout << "NO";
    else {
      cout << "YES";
      cout << "\n";
      ans += '.';
      for (int i = back + 1; i <= n; i++) ans += s[i - 1];
      result.push_back(ans);
      for (string x : result) cout << x << endl;
    }
  }
  return 0;
}
