instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a woman in a messy kitchen with a child'. Find frequency of the letter 'a'
answer:
4


question:
Sentence: 'two zebras standing around while a third zebra drinks from a pond'. Find frequency of the letter 's'
answer:
3


question:
Sentence: 'a lady is smiling before hitting the ski slope'. Find frequency of the letter 'r'
answer:

1