The task is to read a passage and convert numbers in their text forms into digit forms. The text numbers can be used to represent Quantity, Dates and Time, Addresses or Positions.

Oswald apparently started reading about communism when he was about fifteen.
Oswald apparently started reading about communism when he was about 15.

At one:fifty one p.m., police car two reported by radio that it was on the way to headquarters with the suspect.
At 1:51 p.m., police car 2 reported by radio that it was on the way to headquarters with the suspect.

New liabilities were incurred to the extent of one hundred thousand pounds by more failures, and in eighteen nineteen,

New liabilities were incurred to the extent of £100,000 by more failures, and in 1819,