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: 'a surfer wipes out on a huge wave'. Find frequency of the letter 'a'

A: 3
****
Q: Sentence: 'a dog sitting up in a car window'. Find frequency of the letter 'u'

A:
1
****