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

Sentence: 'a toilet of some sort near a sink of some sort'. Find frequency of the letter 'o'
7

Sentence: 'a man working on a small laptop on a wooden table'. Find frequency of the letter 'l'
4

Sentence: 'three men sitting at a table eating breakfast'. Find frequency of the letter 'e'

6