instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a plane with stairs next to it sitting in a large lot'. Find frequency of the letter 'i'
answer:
6


question:
Sentence: 'a child sitting a table with a pizza in front of him'. Find frequency of the letter 'h'
answer:
3


question:
Sentence: 'a baseball player throws out a fast pitch'. Find frequency of the letter 't'
answer:

4