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

Sentence: 'baseball player reaching back as he's about to throw the ball'. Find frequency of the letter 'e'
5

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

Sentence: 'a man is wearing colorful sunglasses and two colorful ties as he poses'. Find frequency of the letter 'p'

1