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

Sentence: 'a dog laying on the back of a boat in the water'. Find frequency of the letter 't'
4

Sentence: 'a man holding a baseball bat an playing baseball'. Find frequency of the letter 'l'
6

Sentence: 'a table with two water bottle, wallet, cell phone, thermometer, tissues, netflix envelopes, a magazine, and three remotes'. Find frequency of the letter 's'

5