Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: It is "not practical" to completely close the UK's borders given the amount of medicines and food imported into the country, the prime minister has said.

Covid: 'Not practical' to close UK borders, says Boris Johnson