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

Sentence: 'this is a close up view of a tennis player during the game'. Find frequency of the letter 't'
3

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

Sentence: 'a couple of beautiful women walking down street holding umbrellas'. Find frequency of the letter 'l'

6