instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a train sits on a railroad track as a metal awning covers it'. Find frequency of the letter 'l'
answer:
2


question:
Sentence: 'a batter, catcher and umpire waiting for the pitch and a major league baseball game'. Find frequency of the letter 'c'
answer:
3


question:
Sentence: 'a young man jumping in the air on his skateboard at a park in the city'. Find frequency of the letter 'u'
answer:

2