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

[EX Q]: Sentence: 'a line of people on motorcycles on the road'. Find frequency of the letter 'e'
[EX A]: 5

[EX Q]: Sentence: 'a man standing in front of a statue near a metal pole'. Find frequency of the letter 'f'
[EX A]: 2

[EX Q]: Sentence: 'the young man is making a phone call as he stands in front of a glass-walled building'. Find frequency of the letter 't'
[EX A]:
3