instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a wedding cake with pink roses on a silver plate'. Find frequency of the letter 'a'
answer:
4


question:
Sentence: 'a picture of two computers on a table'. Find frequency of the letter 'r'
answer:
2


question:
Sentence: 'birds aflight above trees, against a blue day lit sky'. Find frequency of the letter 'e'
answer:

4