Q: Given a passage and a question, find the answer to the question based on the passage. The answer should consist of only one word that lies in the span of only one of the sentences in the passage.
Paragraph: VINs were first used in 1954 . From 1954 to 1981 , there was no accepted standard for these numbers , so different manufacturers used different formats .
Question: when did they start putting vin numbers on cars

A:
1954