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

[EX Q]: Sentence: 'a woman is looking at sheep off in a field'. Find frequency of the letter 'm'
[EX A]: 1

[EX Q]: Sentence: 'old double decker bus parked in a lot'. Find frequency of the letter 't'
[EX A]: 1

[EX Q]: Sentence: 'a group of men standing on the side of a boat'. Find frequency of the letter 'o'
[EX A]:
5