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 sheep in a field in front of other sheep'. Find frequency of the letter 'f'

A: 3
****
Q: Sentence: 'a pretty young lady holding a dark colored umbrella'. Find frequency of the letter 'l'

A:
5
****