#include <bits/stdc++.h>
using namespace std;
int main() {
  vector<vector<char> > v(4);
  for (int i = 0; i < 4; i++) v[i].resize(4);
  for (int i = 0; i < 4; i++) {
    for (int j = 0; j < 4; j++) {
      cin >> v[i][j];
    }
  }
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
      int cntd = 0, cnth = 0;
      if (v[i][j] == '#')
        cnth++;
      else
        cntd++;
      if (v[i][j + 1] == '#')
        cnth++;
      else
        cntd++;
      if (v[i + 1][j] == '#')
        cnth++;
      else
        cntd++;
      if (v[i + 1][j + 1] == '#')
        cnth++;
      else
        cntd++;
      if (cntd >= 3 || cnth >= 3) {
        cout << "YES\n";
        return 0;
      }
    }
  }
  cout << "NO\n";
}
