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

Sentence: 'pizza with different vegetables sitting on top of a wooden slab'. Find frequency of the letter 'o'
5

Sentence: 'silhouette of person playing frisbee with moutain and sunset'. Find frequency of the letter 'i'
5

Sentence: 'an empty bathroom with a very clean sink'. Find frequency of the letter 'h'
2