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

Sentence: 'older man getting ready to swing his bat at a ball on a stand in front of a group of viewers'. Find frequency of the letter 'n'
7

Sentence: 'a man pushing a cart full of bananas'. Find frequency of the letter 'u'
2

Sentence: 'an open laptop computer sitting on top of a desk'. Find frequency of the letter 'g'

1