instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a woman is looking at sheep off in a field'. Find frequency of the letter 'm'
answer:
1


question:
Sentence: 'this yellow fire hydrant sits in a grass field'. Find frequency of the letter 'i'
answer:
5


question:
Sentence: 'a cat is sitting behind the tire of a truck'. Find frequency of the letter 'i'
answer:

5