In this task, you are given a premise sentence. Your task is to write a new sentence by substituting the subject and object (i.e., the input's subject should be output's object and vice versa.). The generated sentence must be fluent and shouldn't change the voice (i.e., passive or active) of the input.

The lawyer helped the judges .
The judges helped the lawyer .

The manager contacted the tourists who the professor believed .
The tourists contacted the professor .

The doctors introduced the tourists .

The tourists introduced the doctors .