instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a person on a surfboard in the surf of a wave'. Find frequency of the letter 's'
answer:
3


question:
Sentence: 'a group of men standing on the side of a boat'. Find frequency of the letter 'o'
answer:
5


question:
Sentence: 'the woman is eating a piece of pizza at the table'. Find frequency of the letter 'i'
answer:

4