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

Sentence: 'the bathroom is in need of remodel'. Find frequency of the letter 'e'
5

Sentence: 'an old glass vase containing flowers on a glass table'. Find frequency of the letter 'b'
1

Sentence: 'a small bathroom is done in white with blue walls'. Find frequency of the letter 'n'

2