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

[EX Q]: Sentence: 'a man flying through the air on top of a skateboard'. Find frequency of the letter 'h'
[EX A]: 3

[EX Q]: Sentence: 'oranges are sitting in a bowl on a table'. Find frequency of the letter 'a'
[EX A]: 5

[EX Q]: Sentence: 'there is a view of a living room that has a red chair'. Find frequency of the letter 'm'
[EX A]:
1