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

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

Sentence: 'a group of people walking down a rain soaked street with umbrellas'. Find frequency of the letter 'w'
3

Sentence: 'a photo of a couple of people at a convention'. Find frequency of the letter 'v'

1