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

Q: Sentence: 'a close up of a bird on the outside window sill'. Find frequency of the letter 'c'

A: 1
****
Q: Sentence: 'baseball player reaching back as he's about to throw the ball'. Find frequency of the letter 'e'

A: 5
****
Q: Sentence: 'a group of boats bob in the water at sunset'. Find frequency of the letter 'a'

A:
4
****