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

Sentence: 'a woman is taking a sip of a drink from a glass'. Find frequency of the letter 'i'
4

Sentence: 'a knife a cutting board some bananas and a toaster'. Find frequency of the letter 'i'
2

Sentence: 'woman in red jacket playing with her two black and white dogs'. Find frequency of the letter 't'

4