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

Sentence: 'a white and blue plate topped with meat and a salad'. Find frequency of the letter 'u'
1

Sentence: 'man riding a skate board down the little board way'. Find frequency of the letter 'k'
1

Sentence: 'barely lit ,empty living room with fireplace and large television'. Find frequency of the letter 'e'

7