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

[EX Q]: Sentence: 'wooden and black bench on the side of the road'. Find frequency of the letter 'a'
[EX A]: 3

[EX Q]: Sentence: 'a woman cross country skiing in a competition'. Find frequency of the letter 's'
[EX A]: 3

[EX Q]: Sentence: 'two chefs in the kitchen in front of sink with geese hanging from the top'. Find frequency of the letter 'm'
[EX A]:
1