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

Sentence: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'
5

Sentence: 'bathroom scene with a black cat going behind the door'. Find frequency of the letter 'e'
4

Sentence: 'someone's toes that are not covered by a blanket'. Find frequency of the letter 't'
5