instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a piece of bread stuffed with meat and vegetables'. Find frequency of the letter 's'
answer:
2


question:
Sentence: 'a burning wood stove has a tea pot sitting on top of it and is full of wood'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a red train sitting in a train station under a blue sky'. Find frequency of the letter 'i'
answer:

6