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

Q: Sentence: 'a group of three dogs laying on a kitchen floor'. Find frequency of the letter 'r'

A: 3
****
Q: Sentence: 'a toasted sub sandwich is next to a salad'. Find frequency of the letter 'a'

A: 6
****
Q: Sentence: 'long sized personal riding train running down large field area'. Find frequency of the letter 'p'

A:
1
****