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

Sentence: 'a display case filled with lots of different clocks'. Find frequency of the letter 'w'
1

Sentence: 'an image of a cautionary construction sign'. Find frequency of the letter 'a'
5

Sentence: 'a man riding a skateboard on a brick road'. Find frequency of the letter 'e'

1