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

Q: Sentence: 'an area that has surrounded by a metal fence'. Find frequency of the letter 'o'

A: 1
****
Q: Sentence: 'a white bowl filled with peeled orange slices'. Find frequency of the letter 's'

A: 2
****
Q: Sentence: 'baseball player reaching back as he's about to throw the ball'. Find frequency of the letter 'e'

A:
5
****