In the list of tokens, identify 'Person', 'Location', and 'Organisation' and label each accordingly. If the entity spans multiple tokens, use the prefix B-PER, B-LOC, or B-ORG for the first token, and I-PER, I-LOC, or I-ORG for the subsequent tokens of that entity. The beginning of each separate entity should always be labeled with a B-PER, B-LOC, or B-ORG prefix. If the token does not fit into any of the three named categories, or is not a named entity, label it as 'O'. Each line should contain one token and its corresponding label, separated by a colon. Do not combine tokens on your own. The format for each line should be: 'token:label'.

Text: Trading
on
the
stock
exchange
floor
was
halted
earlier
today
due
to
a
technical
issue
.
Answer: 
Trading:O
on:O
the:O
stock:O
exchange:O
floor:O
was:O
halted:O
earlier:O
today:O
due:O
to:O
a:O
technical:O
issue:O
.:O