instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'there is an old stove with old pots on the burners'. Find frequency of the letter 't'
answer:
5


question:
Sentence: 'a flock of sheep grazing in a park'. Find frequency of the letter 'f'
answer:
2


question:
Sentence: 'an adult teaching a child to play tennis on an asphalt court'. Find frequency of the letter 'y'
answer:

1