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

[EX Q]: Sentence: 'a man in a suit makes the first slice into a cake'. Find frequency of the letter 't'
[EX A]: 4

[EX Q]: Sentence: 'a batter, catcher and umpire waiting for the pitch and a major league baseball game'. Find frequency of the letter 'c'
[EX A]: 3

[EX Q]: Sentence: 'a golden haired dog looking out of an open window'. Find frequency of the letter 'd'
[EX A]:
4