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

Sentence: 'a group of men standing on the side of a boat'. Find frequency of the letter 'o'
5

Sentence: 'red chair next to side table with lamp in residential home'. Find frequency of the letter 'm'
2

Sentence: 'there is a bowl that has different color cauliflower'. Find frequency of the letter 'a'

4