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

Q: Sentence: 'a truck with a camper sits parked in some vegetation'. Find frequency of the letter 's'

A: 3
****
Q: Sentence: 'the skateboarder has on red and black sneakers and is riding a skateboard'. Find frequency of the letter 'g'

A: 1
****
Q: Sentence: 'an electric commuter train on the tracks under a cloudy sky'. Find frequency of the letter 'l'

A:
2
****