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

[EX Q]: Sentence: 'oranges are sitting in a bowl on a table'. Find frequency of the letter 'a'
[EX A]: 5

[EX Q]: Sentence: 'a large group of motorcycles parked along a street'. Find frequency of the letter 'a'
[EX A]: 5

[EX Q]: Sentence: 'a group of elephants including mothers and babies'. Find frequency of the letter 'a'
[EX A]:
4