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

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

Sentence: 'a view from a bathroom shows an open door'. Find frequency of the letter 'o'
7

Sentence: 'several people walking down the street past vending machines'. Find frequency of the letter 'p'

3