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: 'the large modern train is on the train track'. Find frequency of the letter 'm'

Answer: 1


Question: Sentence: 'a red fire hydrant opened and spilling water'. Find frequency of the letter 'd'

Answer: 4


Question: Sentence: 'two women looking at pictures on a camera'. Find frequency of the letter 'o'

Answer:
5