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

Sentence: 'a group of men standing on the side of a boat'. Find frequency of the letter 'o'
5

Sentence: 'a man working on a small laptop on a wooden table'. Find frequency of the letter 'l'
4

Sentence: 'a clock flanked by statues adorns a building'. Find frequency of the letter 'l'

3