With no explanation, label each line with "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
After
Stalin
's
death
,
life
became
easier
.
After:O
Stalin:person-politician
's:O
death:O
,:O
life:O
became:O
easier:O
.:O