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: 'city two way street with cars lined up on both sides'. Find frequency of the letter 'h'
[EX A]: 2

[EX Q]: Sentence: 'a stone building with a clock tower on an overcast day'. Find frequency of the letter 'i'
[EX A]:
3