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

Sentence: 'hand holding a white calculator inside a store'. Find frequency of the letter 'o'
3

Sentence: 'a man standing in front of a statue near a metal pole'. Find frequency of the letter 'f'
2

Sentence: 'a man that is on a tennis court with a racket'. Find frequency of the letter 't'

6