instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a yellow fire hydrant in the forefront of a roadway'. Find frequency of the letter 'r'
answer:
5


question:
Sentence: 'a man hits a tennis ball with a racket on the court'. Find frequency of the letter 'c'
answer:
2


question:
Sentence: 'two square white frosted cakes on a table'. Find frequency of the letter 's'
answer:

3