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

Q: Sentence: 'a piece of film shows two street signs crossing each other'. Find frequency of the letter 'f'

A: 2
****
Q: Sentence: 'a person is holding a chocolate doughnut with rainbow sprinkles'. Find frequency of the letter 's'

A: 4
****
Q: Sentence: 'a group of people walking down a street with an umbrella'. Find frequency of the letter 'w'

A:
3
****