You are given an expression comprised of integers separated by operators, as well as the result of the expression preceded by an equals symbol =. However, some of the digits in the expression have been replaced by question marks ?. You must restore the missing digits to the expression in such a way that it stays correct.
The digits to the right of the equals sign = will never be replaced by question marks ? .
Each expression can have several operators, but of the same type only.
INPUT:
A single line expression containing positive integers, and the operators +, -, *, / and the = sign. Some digits will be replaced by ? characters. Each number and symbol is separated by a space.
OUTPUT:
The same expression with each ? replaced with the proper digit for the expression to be true.
