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

[EX Q]: Sentence: 'a man playing baseball on a television set'. Find frequency of the letter 'l'
[EX A]: 4

[EX Q]: Sentence: 'two indian women in colorful garb standing barefoot with two indian men'. Find frequency of the letter 'd'
[EX A]: 3

[EX Q]: Sentence: 'a pizza that is on a platter on a table'. Find frequency of the letter 'a'
[EX A]:
7