Use of uninitialized value in print at Unit3.pm line 142, <STDIN> line 12.
Use of uninitialized value in string eq at Unit3.pm line 144, <STDIN> line 12.
Use of uninitialized value in string ne at Unit3.pm line 149, <STDIN> line 12.
Use of uninitialized value in print at Unit3.pm line 142, <STDIN> line 12.
Use of uninitialized value in string eq at Unit3.pm line 144, <STDIN> line 12.
Use of uninitialized value in string ne at Unit3.pm line 149, <STDIN> line 12.