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

Sentence: 'town clocks affixed to a tall, brick building'. Find frequency of the letter 'r'
1

Sentence: 'a couple of girls are hanging out at a restaurant'. Find frequency of the letter 'l'
2

Sentence: 'a clock tower that has a weather vane on the top'. Find frequency of the letter 'e'

5