In this task, you need to count the number of times the given letter appears in the given sentence.

[Q]: Sentence: 'a man in costume talking on a cell phone'. Find frequency of the letter 'm'
[A]: 2


[Q]: Sentence: 'many different species of sheep in display at a museum'. Find frequency of the letter 'h'
[A]: 1


[Q]: Sentence: 'a woman placing bags into an old suitcase'. Find frequency of the letter 'o'
[A]:
3