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

Sentence: 'a bowl of granola, dried fruit, and bananas'. Find frequency of the letter 'u'
1

Sentence: 'a person standing operating a cell phone in a room'. Find frequency of the letter 'n'
6

Sentence: 'a person on a snowboard on a snowy day'. Find frequency of the letter 'o'

6