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

Sentence: 'man sitting on the side of a van playing the guitar'. Find frequency of the letter 'm'
1

Sentence: 'a person on a surfboard in the surf of a wave'. Find frequency of the letter 's'
3

Sentence: 'a living room with wooden flooring and furniture'. Find frequency of the letter 'e'

2