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

Sentence: 'a closeup view of a bathroom sink, that is very modern'. Find frequency of the letter 'e'
4

Sentence: 'a couple of items that are on the wall'. Find frequency of the letter 'm'
1

Sentence: 'a guy doing a trick on a skateboard and ramp'. Find frequency of the letter 'r'

3