public static boolean checkPattern(List<String> G, List<String> P, int start_i, int start_j){
        int R = G.size();
        int C = G.get(0).length();
        
        int r = P.size();
        int c = P.get(0).length();
        
        int end_i = start_i + (r-1);
        int end_j = start_j + (c-1);
        
        if(end_i >= R || end_j >= C)
          return false;
        
        for(int i = 0; i < r; i++)
          for(int j = 0; j < c; j++){
            char pattern_num = P.get(i).charAt(j);  
            char grid_num = G.get(i + start_i).charAt(j + start_j);
            if(grid_num != pattern_num) return false;
            }
        return true;
        }
    
    public static String gridSearch(List<String> G, List<String> P) {
        int R = G.size();
        int C = G.get(0).length();
        char first_pattern_num = P.get(0).charAt(0);
        
        for(int i = 0; i < R; i++)
          for(int j = 0; j < C; j++){
            char grid_num = G.get(i).charAt(j);
            if(grid_num == first_pattern_num && checkPattern(G,P,i,j) )
              return "YES";
            }
        return "NO";
        }