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

Sentence: 'a cat sleeping near lots of pairs of shoes'. Find frequency of the letter 'r'
2

Sentence: 'a group of workers washing and cleaning fruits and vegetables'. Find frequency of the letter 'i'
3

Sentence: 'a close up of a bear walking on a path near a fence'. Find frequency of the letter 'g'

1