Please input the file pathname: e4.txt

> list
Helena ($10000, 7 days)
Jason ($20000, 21 days)
Kit ($30000, 21 days)
LazyGuy ($45000, 30 days)

> exchangeSalaries Helena LazyGuy
Done.

> list
Helena ($45000, 7 days)
Jason ($20000, 21 days)
Kit ($30000, 21 days)
LazyGuy ($10000, 30 days)

> exchangeSalaries Helena Jason
Done.

> list
Helena ($20000, 7 days)
Jason ($45000, 21 days)
Kit ($30000, 21 days)
LazyGuy ($10000, 30 days)

> undo

> list
Helena ($45000, 7 days)
Jason ($20000, 21 days)
Kit ($30000, 21 days)
LazyGuy ($10000, 30 days)

> undo

> list
Helena ($10000, 7 days)
Jason ($20000, 21 days)
Kit ($30000, 21 days)
LazyGuy ($45000, 30 days)

> redo

> list
Helena ($45000, 7 days)
Jason ($20000, 21 days)
Kit ($30000, 21 days)
LazyGuy ($10000, 30 days)

> redo

> list
Helena ($20000, 7 days)
Jason ($45000, 21 days)
Kit ($30000, 21 days)
LazyGuy ($10000, 30 days)