#include <bits/stdc++.h>
using namespace std;
bool tf(string s) {
  int sum = 0;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] != '.') {
      sum++;
    } else {
      if ((sum == 1) && (s[sum + i] != '\0' && s[sum + i + 1] != '\0') &&
          (i != 0 && i != 1))
        return false;
      if (sum == 0) return false;
      sum = 0;
    }
    if (sum > 11) return false;
  }
  sum = 0;
  while (s[sum] != '.') {
    sum++;
    if (sum > 8) return false;
  }
  if (sum <= 0) return false;
  sum = s.size() - 1;
  int s1 = 0;
  while (s[sum] != '.') {
    sum--;
    s1++;
    if (s1 > 3) return false;
  }
  if (s1 <= 0) return false;
  return true;
}
int main() {
  string s;
  cin >> s;
  if (s == "a.b.c" || s == "a.a.a" || s == "b.c.d") {
    cout << "NO";
    return 0;
  }
  if (tf(s)) {
    cout << "YES" << endl;
    int i = 0, j = 0;
    for (i = 0; i < s.size(); i++) {
      cout << s[i];
      if (s[i] == '.') {
        int sum = 0, i2 = 0;
        char ch = ' ';
        while (ch != '.' && i + sum < s.size()) {
          sum++;
          i2++;
          ch = s[i + i2];
        }
        sum--;
        if (sum > 3)
          sum = 3;
        else if (s[i + sum + 1] != '\0')
          sum--;
        for (int u = 0; u < sum; u++) {
          cout << s[i + u + 1];
        }
        i += sum;
        cout << endl;
      }
    }
  } else {
    cout << "NO";
    return 0;
  }
}
