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 passenger train that is going over a bridge'. Find frequency of the letter 't'

Answer: 3


Question: Sentence: 'pedestrians pass by a stop sign, some holding surfboards'. Find frequency of the letter 'n'

Answer: 3


Question: Sentence: 'boat running over the ocean creating large wakes'. Find frequency of the letter 'n'

Answer:
5