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: 'two pepperoni pizzas and a cup on a counter'. Find frequency of the letter 'u'

Answer: 2


Question: Sentence: 'two zebras feed on a plant through some wire mesh'. Find frequency of the letter 'o'

Answer: 4


Question: Sentence: 'a banana that was placed under a purple pillow'. Find frequency of the letter 'n'

Answer:
3