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You're given a polynomial, the coefficients of which are all integers. Now, it's your time to find out all the integral roots of it! Just try your best!
The input consists of several test cases.
Output the answers for each test case. The first line contains an integer R, the number of integral roots of the given polynomial. Each of the next R lines contains a root of the given polynomial. They should be outputed in non-descending order. Note if the polynomial has multiple roots you must output all of them.
4 1 0 -1 -1 2 2 1
2 -1 1 2 -1 -1
POJ Monthly--2007.11.25, Zhou Dong
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