input: 
  def VersionControl(lines: List[str]) -> object:
      """ Implement a basic version control system in Python that keeps track of changes in the code.
      The class `VersionControl` should have methods to commit changes and restore to a previous state.
      Each commit should log the current state of the lines and a mark (sequential number). The restore
      method should revert the lines to the state recorded at the previous mark.
      >>> vc = VersionControl(['print("Hello, World!")', 'a = 10', 'b = 20'])
      >>> vc.commit()
      >>> vc.lines = ['print("Hello, World!")', 'a = 10', 'b = 20', 'c = a + b']
      >>> vc.commit()
      >>> vc.restore()
      >>> vc.lines
      ['print("Hello, World!")', 'a = 10', 'b = 20']
      """
      class VersionControl:
          def __init__(self, lines):
              self.lines = lines
              self.mark = 0
       
          def commit(self):
              self.mark += 1
              log_file = open("log_file.txt", "a+")
              log_file.write(str(self.mark) + ": " + str(self.lines))
              log_file.close()
       
          def restore(self):
              log_file = open("log_file.txt", "r")
              lines = log_file.readlines()
              to_mark = self.mark-1
       
              self.lines = lines[to_mark]
              log_file.close()
      return VersionControl(lines)
  
output:     
              self.lines = eval(lines[to_mark].split(": ")[1])
  