instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a group of people walking down a rain soaked street with umbrellas'. Find frequency of the letter 'w'
answer:
3


question:
Sentence: 'a woman throwing a frisbee on a field'. Find frequency of the letter 's'
answer:
1


question:
Sentence: 'a very tall brick clock tower with a clock on each of it's sides'. Find frequency of the letter 'h'
answer:

2