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

Q: Sentence: 'several zebras  and a giraffe in an enclosure'. Find frequency of the letter 's'

A: 3
****
Q: Sentence: 'the two dogs are playing in the pen together'. Find frequency of the letter 'o'

A: 3
****
Q: Sentence: 'a couple of planes parked in the driveway of a home'. Find frequency of the letter 'l'

A:
2
****