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: 'man in air skateboarding on street with building'. Find frequency of the letter 't'
answer:
4


question:
Sentence: 'a man posing with a hot dog and bun in his mouth'. Find frequency of the letter 'a'
answer:

4