text: class Vector:
  
      def __init__(self,vec):
          self.vec = vec
      
      def __str__(self):
          return f"{self.vec[0]}i + {self.vec[1]}j + {self.vec[2]}k"
  
  v1 = Vector([1,2,3])
  v2 = Vector([5,7,9])
  print(v1)
  print(v2)
  