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

Q: Sentence: 'a guy surfs a wave with his surfboard'. Find frequency of the letter 's'

A: 4
****
Q: Sentence: 'three birds are sitting on a tree in a forest'. Find frequency of the letter 'h'

A: 1
****
Q: Sentence: 'a brown and black bull cars a scooter and buildings'. Find frequency of the letter 'i'

A:
2
****