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: 'an orange cat sitting on the ground next to a  purse'. Find frequency of the letter 's'
answer:
2


question:
Sentence: 'a man stands on a stage in front of a drummer singing into a microphone'. Find frequency of the letter 'r'
answer:

4