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

Q: Sentence: 'the large modern train is on the train track'. Find frequency of the letter 'm'

A: 1
****
Q: Sentence: 'a man serving himself pizza in a wooden booth'. Find frequency of the letter 'n'

A: 4
****
Q: Sentence: 'a crowded city street with a tall white building'. Find frequency of the letter 'd'

A:
3
****