With no explanation, label each line with "O", "location-road/railway/highway/transit", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
is
on
the
popular
direct
route
Amritsar–Kolkata
Main
Line
.
It:O
is:O
on:O
the:O
popular:O
direct:O
route:O
Amritsar–Kolkata:location-road/railway/highway/transit
Main:location-road/railway/highway/transit
Line:location-road/railway/highway/transit
.:O