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

[Q]: Sentence: 'a piece of film shows two street signs crossing each other'. Find frequency of the letter 'f'
[A]: 2


[Q]: Sentence: 'a man paddle boarding by a boat dock in a city'. Find frequency of the letter 'o'
[A]: 3


[Q]: Sentence: 'a man climbing a ladder on to an airplane in flight from a motorcycle'. Find frequency of the letter 'b'
[A]:
1