instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a stuffed animal sitting on an empty bed'. Find frequency of the letter 'u'
answer:
1


question:
Sentence: 'a man and several white red and blue airplanes'. Find frequency of the letter 'u'
answer:
1


question:
Sentence: 'woman walking and talking on cellphone with people in background'. Find frequency of the letter 'l'
answer:

5