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

Sentence: 'a woman in yellow dress standing next to a horse'. Find frequency of the letter 'l'
2

Sentence: 'a woman in a tank top reaches out for a frisbee'. Find frequency of the letter 'a'
6

Sentence: 'two people standing at a table cutting a cake'. Find frequency of the letter 'b'

1