With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Doherty
started
his
strike
on
22
May
.
Doherty:person-other
started:O
his:O
strike:O
on:O
22:O
May:O
.:O