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

Sentence: 'a woman is playing an interactive video game'. Find frequency of the letter 't'
2

Sentence: 'a bunch of green bananas is hanging on a tree'. Find frequency of the letter 'n'
7

Sentence: 'a pretty young girl holding and hugging her pet kitty'. Find frequency of the letter 'i'

4