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: 'a photo of a couple of people at a convention'. Find frequency of the letter 'v'
[A]: 1


[Q]: Sentence: 'a red vase with bright yellow flowers in it'. Find frequency of the letter 'h'
[A]:
2