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

Q: Sentence: 'three elephants walk up a dirt trail from the water'. Find frequency of the letter 'l'

A: 3
****
Q: Sentence: 'a blue fire hydrant painted on the bottom of it'. Find frequency of the letter 'h'

A: 2
****
Q: Sentence: 'a fire hydrant on the sidewalk of a marriot courtyard motel'. Find frequency of the letter 'r'

A:
6
****