In this task, you need to count the number of times the given letter appears in the given sentence.
One example is below.
Q: Sentence: 'a large group of bananas proped up on several bicycles'. Find frequency of the letter 'e'
A: 5
Rationale: The letter 'e' appears 5 times in the sentence.
Q: Sentence: 'a suitcase sits next to the pole of a street sign'. Find frequency of the letter 'e'
A:
6