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

Sentence: 'a person holding onto a pink kite at the beach'. Find frequency of the letter 'n'
4

Sentence: 'a man with glasses adjusting his tie in a mirror'. Find frequency of the letter 's'
5

Sentence: 'chicken, bread, crackers and potatoes adorn a white plate'. Find frequency of the letter 'd'

3