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

[EX Q]: Sentence: 'a man walking a large elephant down a dirt road'. Find frequency of the letter 'g'
[EX A]: 2

[EX Q]: Sentence: 'man is snow gear and skis skiing in the snow'. Find frequency of the letter 'i'
[EX A]: 5

[EX Q]: Sentence: 'a toast and tomato breakfast with orange juice'. Find frequency of the letter 'b'
[EX A]:
1