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

Q: Sentence: 'men standing in the grass with a frisbee'. Find frequency of the letter 'a'

A: 3
****
Q: Sentence: 'a passenger train that is going over a bridge'. Find frequency of the letter 't'

A: 3
****
Q: Sentence: 'a piece of blueberry crumble is shown on a plate with a fork'. Find frequency of the letter 'k'

A:
1
****