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In life, the bar code information is often used to mark items. Barcode is composed of black and white stripes. The width of the strip, there are two, we can consider a narrow represents 0, representative of a wide. In this problem is to set the width of the narrow width twice. Nan has a strong DIY spirit of God, he decided to do a barcode recognition tools. First he completed a image recognition part, a series of width. He hoped that these widths identified as a 01 string. It would be a very simple task, but because Nan God when there will be errors in identification, making the problem becomes not so simple. But Nan God think the results measured up to larger or smaller than the true value of 5 . Please help complete the identification process. Known in the bar code is at least one wide strip, the strips may not be. Enter the first acts of a number n (n < 20), said Nan God identified the n-bar. The second behavior n positive integers not greater than 10 ^ 8. Output that is a string