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

Q: Sentence: 'two little girls playing with a bat and a tennis ball'. Find frequency of the letter 'w'

A: 2
****
Q: Sentence: 'a white toilet sitting next to a bathroom sink'. Find frequency of the letter 'b'

A: 1
****
Q: Sentence: 'a black steam engine sits on some train tracks on display'. Find frequency of the letter 'o'

A:
3
****