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

Q: Sentence: 'a double decker transit bus parks by a blue on the side of the street in front of a brick building in the city'. Find frequency of the letter 't'

A: 9
****
Q: Sentence: 'one man grabbing another at a table while laughing'. Find frequency of the letter 'n'

A: 5
****
Q: Sentence: 'a tennis player with a cap holding a racket'. Find frequency of the letter 'r'

A:
2
****