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

Sentence: 'a photo of a small boat on a shore'. Find frequency of the letter 'f'
1

Sentence: 'a crowd of fans watch soccer players from stadium seating'. Find frequency of the letter 'f'
3

Sentence: 'two people holding skis standing at the base of a large snow pile'. Find frequency of the letter 'e'

6