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

[EX Q]: Sentence: 'a lady is standing near a luggage stand at the air port'. Find frequency of the letter 'a'
[EX A]: 9

[EX Q]: Sentence: 'a bunch of broken down trains sit in a yard'. Find frequency of the letter 'n'
[EX A]: 5

[EX Q]: Sentence: 'view of huge bed with picture frame hanging above it, and day bed in front of window'. Find frequency of the letter 'i'
[EX A]:
7