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

Sentence: 'a doll with huge eyes and black hair with blunt bangs holds a red umbrella'. Find frequency of the letter 'e'
5

Sentence: 'a tower with some bright lights and clocks on it'. Find frequency of the letter 'h'
3

Sentence: 'a bunch of people are standing out in a field a red one has their arms out as a white ball is in the air'. Find frequency of the letter 'e'
9