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

Sentence: 'a woman sitting in front of a giant slice of cheese pizza'. Find frequency of the letter 'e'
4

Sentence: 'a young girl is brushing her teeth in this dated photo'. Find frequency of the letter 't'
5

Sentence: 'a biplane flying through a blue cloud filled sky'. Find frequency of the letter 'h'

2