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

Sentence: 'eight donuts are cooked together in oil in a metal tray'. Find frequency of the letter 'h'
2

Sentence: 'a blue tripocal bird is perched on a wooden fence'. Find frequency of the letter 'd'
3

Sentence: 'the mirror of a car and a road'. Find frequency of the letter 'e'

1