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

Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'
3

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

Sentence: 'the stuffed bears are much larger than the baby'. Find frequency of the letter 'r'

4