#include<bits/stdc++.h> 
using namespace std;//arr[i][j] arr[i+1][j] arr[i+1][j+1] arr[i][j+1]
//arr[i][j]=='#'&&arr[i+1][j]=='#'&&arr[i+1][j+1]=='#'||arr[i][j]=='#'&&arr[i+1][j]=='#'&&arr[i][j+1]=='#'||arr[i][j]=='#'&&arr[i+1][j+1]=='#'&&arr[i][j+1]=='#'||arr[i+1][j]=='#'&&arr[i+1][j+1]=='#'&&arr[i][j+1]=='.'
char arr[6][6]={'0'};
int main(){
    for(int i=1;i<=4;i++){
        for(int j=1;j<=4;j++){
            cin>>arr[i][j];
        }
    }
    for(int i=1;i<=3;i++){
        for(int j=1;j<=3;j++){
            if(arr[i][j]=='#'&&arr[i+1][j]=='#'&&arr[i+1][j+1]=='#'||arr[i][j]=='#'&&arr[i+1][j]=='#'&&arr[i][j+1]=='#'||arr[i][j]=='#'&&arr[i+1][j+1]=='#'&&arr[i][j+1]=='#'||arr[i+1][j]=='#'&&arr[i+1][j+1]=='#'&&arr[i][j+1]=='#'){
                cout<<"YES";
                return 0;
            }
            if(arr[i][j]=='.'&&arr[i+1][j]=='.'&&arr[i+1][j+1]=='.'||arr[i][j]=='.'&&arr[i+1][j]=='.'&&arr[i][j+1]=='.'||arr[i][j]=='.'&&arr[i+1][j+1]=='.'&&arr[i][j+1]=='.'||arr[i+1][j]=='.'&&arr[i+1][j+1]=='.'&&arr[i][j+1]=='.'){
                cout<<"YES";
                return 0;
            }
        }
    }
    cout<<"NO";
    return 0;
}