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

Sentence: 'a man with a large grey and black beard and glasses and a tie'. Find frequency of the letter 'e'
5

Sentence: 'three men are in a kitchen cooking and cutting through a dish'. Find frequency of the letter 'a'
4

Sentence: 'appears to be carrots boiling in a pot of water'. Find frequency of the letter 'o'

5