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

[EX Q]: Sentence: 'a pizza pie sitting on a wooden table with tongs'. Find frequency of the letter 't'
[EX A]: 5

[EX Q]: Sentence: 'a blue fire hydrant painted on the bottom of it'. Find frequency of the letter 'h'
[EX A]: 2

[EX Q]: Sentence: 'a group of people standing around in a backyard'. Find frequency of the letter 's'
[EX A]:
1