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

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

Sentence: 'four men standing around two pizzas in a conference room'. Find frequency of the letter 't'
2

Sentence: 'a person with a cell phone connected to a cord'. Find frequency of the letter 'o'

5