In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'an image of a street sign with a corner restaurant'. Find frequency of the letter 'u'

A: 1
****
Q: Sentence: 'a bus is driving on the street behind some cars'. Find frequency of the letter 'a'

A: 2
****
Q: Sentence: 'a guy jumping high into the air on his skate board'. Find frequency of the letter 's'

A:
2
****