instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a group of people having dinner and drinking wine'. Find frequency of the letter 'r'
answer:
3


question:
Sentence: 'a wedding cake with pink roses on a silver plate'. Find frequency of the letter 'a'
answer:
4


question:
Sentence: 'white plate with meal of carrots, roll and a meat'. Find frequency of the letter 'm'
answer:

2