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: 'the little girl is flying her kite in the field'. Find frequency of the letter 'i'
7

Sentence: 'a kitchen with wood cabinets, stainless steel oven, stainless steel microwave and a refrigerator and a hole where the cooktop goes'. Find frequency of the letter 'l'

5