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

[Q]: Sentence: 'two giraffes standing next to some trees'. Find frequency of the letter 'f'
[A]: 2


[Q]: Sentence: 'a child sitting a table with a pizza in front of him'. Find frequency of the letter 'h'
[A]: 3


[Q]: Sentence: 'a pizza with cheese and spinach on a plate'. Find frequency of the letter 'n'
[A]:
3