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

Sentence: 'a large motorcycle that has a man dressed in old clothing next to it'. Find frequency of the letter 'a'
6

Sentence: 'a man standing on a surf board in the ocean'. Find frequency of the letter 'f'
1

Sentence: 'an airplane flying below another one that is emitting a white stream'. Find frequency of the letter 'w'

2