A five-digit number whose ones digit is 9, if the ones digit is moved to the highest digit, the new five-digit number obtained is 57105 greater than the original five-digit number, what is the original five-digit number?
一个个位数是9的五位数，如果把个位数字移到最高位，所得到的新五位数就比原来的五位数大57105，则原来的五位数是多少．
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