Three Theives (Aldo, Baldo and Caldo) are arrested by three different policemen (Xiao, Yiao and Ziao) standing on the shore.
No Policemen trusts their arrested Theif to be near any other policemen unless they are also with them.

There is a boat that can hold a maximum of two persons.

How can the six people get across the river?

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ADDITIONAL NOTE:-

1. On the other side of the shore, theif is kept in the prision, So, can’t escape.
2. Theif can not escape from the boat if sent alone.
3. Starting Point, Boat and End point are the three different platforms, at a particular time Theif and other Policeman cannot be on same platform. e.g. – A and X can not be in boat.