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

Sentence: 'a variety of a different type of vegetables'. Find frequency of the letter 't'
4

Sentence: 'a jet that is flying in the sky with a banner behind it'. Find frequency of the letter 'r'
1

Sentence: 'a snowboarder making a jump of a snowy ledge'. Find frequency of the letter 'o'

4