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 glass a rope and a pair of scissors'. Find frequency of the letter 's'

A: 6
****
Q: Sentence: 'a zebra and horse in the middle of a dirt field'. Find frequency of the letter 'd'

A:
5
****