instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'there is a woman pointing at something with her dog'. Find frequency of the letter 'i'
answer:
5


question:
Sentence: 'some giraffes moving across a big grass field'. Find frequency of the letter 'e'
answer:
3


question:
Sentence: 'a woman and a child petting a horse'. Find frequency of the letter 'o'
answer:

2