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 black bear sitting in the grass taking a rest'. Find frequency of the letter 'a'
6

Sentence: 'child sitting on the stop of a truck biting into a hot dog'. Find frequency of the letter 'a'

2

