Can You Solve The Riddle?

The 3 prisoners that we see at the picture below they are ready to escape.However the prisoner at the top is few inches away from the window.What the 3 prisoners should do to escape succesfully from the prison?
If you just think simple you will find th answer.If you don't find it scroll down after the picture.

Right Answer
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The 3rd prisoner that he is at the base of the 3 prisoners is the tallest so he have to go at the top to reach the window because he have tall hands :)