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

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

Sentence: 'a railroad train pulling up to the train platform'. Find frequency of the letter 'o'
3

Sentence: 'five men cut a cake at an event'. Find frequency of the letter 't'

3

