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

Q: Sentence: 'a black horse with a white dot on its forehead'. Find frequency of the letter 't'

A: 4
****
Q: Sentence: 'a man with a skateboard that is in the street'. Find frequency of the letter 'o'

A: 1
****
Q: Sentence: 'a newly wed couple celebrating with a toast'. Find frequency of the letter 'a'

A:
4
****