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

Sentence: 'the sun goes down over a bike tied to a bench at the beach'. Find frequency of the letter 't'
5

Sentence: 'a bird in a tree looking up at branches'. Find frequency of the letter 'e'
3

Sentence: 'a cup of coffee is sitting next to a pastry'. Find frequency of the letter 'i'

3