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

Sentence: 'a doorway looking into a small bathroom with white toilet'. Find frequency of the letter 'r'
2

Sentence: 'a man sitting on a motorcycle near two other men'. Find frequency of the letter 'r'
3

Sentence: 'people being served a healthy meal in a village'. Find frequency of the letter 'e'

8