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

Input: Consider Input: Sentence: 'some cubbies with towels in a blue bathroom'. Find frequency of the letter 'l'

Output: 2

Input: Consider Input: Sentence: 'a few giraffes standing in a field looking around'. Find frequency of the letter 'e'

Output: 3

Input: Consider Input: Sentence: 'a tall building with antenna stands before a jet flying in the background'. Find frequency of the letter 't'
Output: 6