Teacher: In this task, you need to count the number of times the given letter appears in the given sentence.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Sentence: 'a large group of bananas proped up on several bicycles'. Find frequency of the letter 'e'
Solution: 5
Reason: The letter 'e' appears 5 times in the sentence.

Now, solve this instance: Sentence: 'chicken, mashed potatoes and cauliflower with broccoli in sauce on a white plate'. Find frequency of the letter 's'
Student:
3