instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a lady is standing near a luggage stand at the air port'. Find frequency of the letter 'a'
answer:
9


question:
Sentence: 'there is an old stove with old pots on the burners'. Find frequency of the letter 't'
answer:
5


question:
Sentence: 'red bicycle and small pylons on a street'. Find frequency of the letter 'b'
answer:

1