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

Sentence: 'a large formal living room with yellow couches and table'. Find frequency of the letter 'v'
1

Sentence: 'man in a radio studio wearing a suit in front of a microphone'. Find frequency of the letter 't'
3

Sentence: 'a novelty train that is red is going down the tracks'. Find frequency of the letter 'i'

4