#!/usr/bin/python3

def main():
       lst=["one", "two", "three"]
       print(len(lst))
       #print (lst[0])
       #print (lst[1])
      
       for el in lst:
                print (el)
       for idx,el in enumerate(lst):
                 print ("idx={},el={}".format(idx,el))

       lst.append("four")
       lst.insert(0,"zero")
       print (lst[3])
       print (*lst)
       s=",".join(lst)
       print (s)
       lst1=s.split(",")
       print(*lst1)
       for el in lst1:
             print(el)
       print (lst1[:-1]) #list[1] list[2]     
       for i in range(10):
              print(i)  
       a=[i for i in range (1,10,2)]
       print (*a, sep='\n')       
               
if __name__=="__main__":
       main()