instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a white and blue plate topped with meat and a salad'. Find frequency of the letter 'u'
answer:
1


question:
Sentence: 'a log in the water with three birds perched on it'. Find frequency of the letter 'r'
answer:
4


question:
Sentence: 'a train engine waiting in front of a depot'. Find frequency of the letter 'e'
answer:

3