a = 10
b = 20 
while a<20 :
    print(a)
    a = a+1




    # i = 0
    # while i< 10:
    #     print("yes" + str(i))
    #     i = i+1
           print("done") ## will print done after every statement 
      print("done") ## will print at last 

      ## a++ will not run .....in python we have to write a = a+1


      ## course
      course = ["html" , "python" , "java"]
      i = 0
      while i< len(course):
          print(course[i])
          i = i+1