instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
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'
answer:
9


question:
Sentence: 'a surfer is in the middle of an ocean wave'. Find frequency of the letter 'i'
answer:
3


question:
Sentence: 'black and white photograph of man and woman sitting on a bench'. Find frequency of the letter 'w'
answer:

2