Missing Digit II

Have the function MissingDigitII(str) take the str parameter, which will be a simple mathematical formula with three numbers, a single operator (+, -, *, or /) and an equal sign (=) and return the two digits that complete the equation. In two of the numbers in the equation, there will be a single ? character, and your program should determine what digits are missing and return them separated by a space. For example, if str is "38?5 * 3 = 1?595" then your program should output 6 1.

The ? character will always appear in both the first number and the last number in the mathematical expression. There will always be a unique solution.

Examples

Input: "56? * 106 = 5?678"
Output: 3 9

Input: "18?1 + 9 = 189?"
Output: 8 0