instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a crowd of fans watch soccer players from stadium seating'. Find frequency of the letter 'f'
answer:
3


question:
Sentence: 'a white toilet sitting next to a bathroom sink'. Find frequency of the letter 'b'
answer:
1


question:
Sentence: 'the old metal bed with dirty linens is the only furnishing in the abandoned room'. Find frequency of the letter 'i'
answer:

7