passport - Filling correctly Place of birth in eTA request

I'm filling an eTA request for Canada. There is a question about
City/town of birth (required)
In my passport my place of birth is not written entirely (i.e., last digit is missing) since it is quite long (4 words with a total of 24 characters).
When answering to this question should I put what it is written in the passport or the full place of birth?
update
Maybe it is worth to mention that it's a Biometric passport so the chip contains my information. The place of birth information contained is the right one (i.e. full birth place name).
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How do I fill in K eTA?
Your eTA is linked to the passport you used to apply. You need to present this passport when you check-in to your flight to Canada. You don't need to print out any special document. The airline staff will scan your passport to confirm that you have a valid eTA.Do you need to print eTA for Canada?
Mistakes on application form can be disastrous. If the mistake is interpreted by officials as an attempt to mislead or deceive, the application must be refused. If the application is for an entry clearance, it will also lead to a 10 year ban on re-entry.What happens if you make a mistake on your visa application?
The Canadian immigration service recommends that you apply for your eTA as soon as you decide to travel to Canada. Most eTA applications are approved within three days. In case of an urgent application, the average time for an eTA application can be as short as 18 minutes.How to Fill Out the DS-11: Application for a U.S. Passport
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