In this task, you need to count the number of times the given letter appears in the given sentence.

[EX Q]: Sentence: 'a glass a rope and a pair of scissors'. Find frequency of the letter 's'
[EX A]: 6

[EX Q]: Sentence: 'the child is waving a small flag as she stands near two women'. Find frequency of the letter 'g'
[EX A]: 2

[EX Q]: Sentence: 'a mirror shows a school bus in a parking lot'. Find frequency of the letter 'b'
[EX A]:
1