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

[EX Q]: Sentence: 'a little boy standing near a couch and a table'. Find frequency of the letter 'i'
[EX A]: 2

[EX Q]: Sentence: 'a plastic container next to a toilet on a wooden box'. Find frequency of the letter 'i'
[EX A]: 3

[EX Q]: Sentence: 'a plane sitting parked on the cement near grass'. Find frequency of the letter 'e'
[EX A]:
6