8. (10 points) When withdrawing money from an $A T M$ machine, one needs to input the bank card password to proceed to the next step. The password is a 6-digit number ranging from 000000 to 999999. A person forgot the password but remembers that it contains the digits 1, 3, 5, 7, 9 and no other digits. If there is no limit to the number of incorrect password attempts, the person can input $\qquad$ different passwords at most to proceed to the next step.
【Analysis】First, consider the password is a 6-digit number, then one of the digits $1,3,5,7,9$ is repeated, the possibility of the repeated digit is $C_{5}^{1}$, then arrange the 6 digits in all possible ways, and also consider the two identical digits, solve accordingly.

【Solution】Solution: According to the analysis, the number of inputs is $\frac{C_{5}^{1} \mathrm{~A}_{6}^{6}}{\mathrm{~A}_{2}^{2}}=1800$. Therefore, the answer is: 1800.