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 commuter bus in england by a clock tower building'. Find frequency of the letter 'w'

Answer: 1

Question: Sentence: 'a piece of bread stuffed with meat and vegetables'. Find frequency of the letter 's'

Answer: 2

Question: Sentence: 'a car and some people with umbrellas and a building'. Find frequency of the letter 'h'

Answer:
1