from collections import defaultdict 
 
class Graph: 
  
   
    def __init__(self): 
  
        
        self.graph = defaultdict(list) 
  
    
    def addEdge(self, u, v): 
        self.graph[u].append(v) 
  
    
    def DFSUtil(self, v, visited): 
  
        
        visited[v] = True
        print(v, end = ' ') 
  
        
        for i in self.graph[v]: 
            if visited[i] == False: 
                self.DFSUtil(i, visited) 
  
   
    def DFS(self, v): 
  
        
        visited = [False] * (max(self.graph)+1) 
  
        
        self.DFSUtil(v, visited)


# Create a graph given  

g = Graph() 
g.addEdge(0, 1) 
g.addEdge(0, 2) 
g.addEdge(1, 2) 
g.addEdge(2, 0) 
g.addEdge(2, 3) 
g.addEdge(3, 3) 
  
print("Following is DFS from (starting from vertex 2)") 
g.DFS(2)