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

Sentence: 'a family sitting at a table in a restaurant looking at their phones'. Find frequency of the letter 't'
8

Sentence: 'a young man riding a skateboard near a forest'. Find frequency of the letter 'd'
2

Sentence: 'the cushioned bench is near an open door'. Find frequency of the letter 'n'

5