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

Sentence: 'a glass bowl of raw broccoli, a ceramic bowl of raw green chili peppers, and steel bowl of raw daikon'. Find frequency of the letter 'a'
9

Sentence: 'a pizza is in a box on a table outside'. Find frequency of the letter 'u'
1

Sentence: 'a couple of birds perched on top of a tree branch'. Find frequency of the letter 'e'

5