instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man with a large grey and black beard and glasses and a tie'. Find frequency of the letter 'e'
answer:
5


question:
Sentence: 'a dog has found a rather large stick for playing fetch'. Find frequency of the letter 't'
answer:
3


question:
Sentence: 'a cat sitting on a bed with the cover ruffled a bit'. Find frequency of the letter 'i'
answer:

4