instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'two men with colorful ties are posing for a picture'. Find frequency of the letter 'r'
answer:
4


question:
Sentence: 'a person that is looking out his window'. Find frequency of the letter 'n'
answer:
3


question:
Sentence: 'a snowboarder is holding his snowboard close to his body'. Find frequency of the letter 's'
answer:

6