Cut a square as large as possible from a rectangular piece of paper with a length of 2002mm and a width of 847mm. If the remaining part is not a square, then cut another square with the largest possible side length from the remaining piece of paper, according to Repeat the above process continuously, what is the side length of the final cut square in millimeters?
从一张长2002毫米、宽847毫米的长方形纸片上剪裁下尽可能大的正方形，如果剩下的部分不是正方形，那么在剩下的纸片上再裁下一个边长尽可能大的正方形，按照上面的过程不断的重复，最后剪得的正方形的边长是多少毫米．
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