instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'an area that has surrounded by a metal fence'. Find frequency of the letter 'o'
answer:
1


question:
Sentence: 'two persons standing outside a moving sub train'. Find frequency of the letter 'a'
answer:
3


question:
Sentence: 'the man is tossing the dough for the pizza'. Find frequency of the letter 'h'
answer:

4