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

Sentence: 'guy leans on truck's hood while taking pics next to parked motorcycles'. Find frequency of the letter 's'
4

Sentence: 'an image of a street sign with a corner restaurant'. Find frequency of the letter 'u'
1

Sentence: 'a steak, a pineapple, and a banana sit on a cutting board'. Find frequency of the letter 'n'

6