instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a bed with a mattress that has nothing on it'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'soccer players on opposite teams fight for control over a ball'. Find frequency of the letter 't'
answer:
4


question:
Sentence: 'a man with a tie in front of a house'. Find frequency of the letter 'e'
answer:

2