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

Sentence: 'a little boy standing near a couch and a table'. Find frequency of the letter 'i'
2

Sentence: 'a railroad train pulling up to the train platform'. Find frequency of the letter 'o'
3

Sentence: 'a group of children standing next to a soldier'. Find frequency of the letter 'l'

2