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

Sentence: 'a couple is cutting in to a cake at a wedding'. Find frequency of the letter 'd'
2

Sentence: 'a woman is looking at sheep off in a field'. Find frequency of the letter 'm'
1

Sentence: 'a platform of various fruits that have different shapes and sizes'. Find frequency of the letter 'r'

4