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

Sentence: 'a man standing on a tennis court holding a racquet'. Find frequency of the letter 's'
2

Sentence: 'the bathroom is in need of remodel'. Find frequency of the letter 'e'
5

Sentence: 'a tiled floor in a large white room'. Find frequency of the letter 'l'

3