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: 'supplies and tools are arranged on the floor with a hard hat and bag'. Find frequency of the letter 'n'
4

Sentence: 'a bunch of traffic passes by a shopping center'. Find frequency of the letter 'a'

4