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

[EX Q]: Sentence: 'people plating cake in an office meeting room'. Find frequency of the letter 'g'
[EX A]: 2

[EX Q]: Sentence: 'seagulls sit on the posts of a seaside balcony by a clock tower'. Find frequency of the letter 'g'
[EX A]: 1

[EX Q]: Sentence: 'a wooden chair sitting on a sidewalk next to a tree'. Find frequency of the letter 'w'
[EX A]:
2