Since all of them are facing East, the left and right should be taken into consideration accordingly.
When a person is facing east, ‘Person’s Right’ will be towards South and ‘Person’s Left’ will be towards North.
Cyclops is to the right of Deadpool.
Deadpool is the third from south.
So, Batman will be at extreme end from the north because it should have Electro as neighbor.
Gambit is between Electro and Falcon.
So, the sequence is –
Deadpool is between Falcon and Cyclops.