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 herd of giraffes in tall african grass'. Find frequency of the letter 'a'
[EX A]: 6

[EX Q]: Sentence: 'a plate full of lettuce, perhaps a salad'. Find frequency of the letter 'r'
[EX A]:
1