In this task, you need to count the number of times the given letter appears in the given sentence.
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Question: Sentence: 'a bus is driving on the street behind some cars'. Find frequency of the letter 'a'

Answer: 2


Question: Sentence: 'a person holding onto a pink kite at the beach'. Find frequency of the letter 'n'

Answer: 4


Question: Sentence: 'vegetables are displayed inside of a lunch box of some kind'. Find frequency of the letter 'i'

Answer:
4