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