Given a string (for example: “a?bc?def?g”), write a program to generate all the possible strings by replacing ? with 0 and 1.
Example:
Input : a?b?c?
Output: a0b0c0, a0b0c1, a0b1c0, a0b1c1, a1b0c0, a1b0c1, a1b1c0, a1b1c1.
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