Select nine numbers from the ten numbers of 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 to form a two digit number, a three digit number and a four digit number, so that the sum of the three numbers equals 2010, then the unselected number is______ ．

Select nine numbers from the ten numbers of 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 to form a two digit number, a three digit number and a four digit number, so that the sum of the three numbers equals 2010, then the unselected number is______ ．

The sum of all the digits in the addend and the sum of all the digits in the sum should be an integral multiple of 9. Because the sum of all the digits in 2010 is: 2 + 0 + 1 + 0 = 3, 0 + 1 + 2 + +9 = (1 + 9) △ 2 = 45; 45 is a multiple of 9, 3 plus 6 is a multiple of 9, so 6 should be removed from it