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

Input: Consider Input: Sentence: 'a bunch of fruit sitting in a bowl, its overflowing'. Find frequency of the letter 't'

Output: 4

Input: Consider Input: Sentence: 'person wearing all white leaned up against a wall with a yellow sign'. Find frequency of the letter 'a'

Output: 8

Input: Consider Input: Sentence: 'a notebook and pen are left on a park bench'. Find frequency of the letter 'e'
Output: 5