Square of difference

Given positive integer $n$. Find and print the square of difference between the maximum and minimum numbers, composed from the digits of number $n$.

For example, if given number is $30605$, the maximum number, composed from its digits, is $65300$, and minimum number is $356$ (the minimum is $00356$, but leading zeros are not counted). The required square of difference is (65300 - 356) * (65300 - 356) = 4217723136.