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

Sentence: 'cars parked outside if a retail store'. Find frequency of the letter 'd'
2

Sentence: 'a man makes some cock tales at a desk'. Find frequency of the letter 'k'
3

Sentence: 'the young woman is laying on the unmade bed'. Find frequency of the letter 'u'

2