100762: [AtCoder]ABC076 C - Dubious Document 2

Problem Statement

E869120 found a chest which is likely to contain treasure.
However, the chest is locked. In order to open it, he needs to enter a string $S$ consisting of lowercase English letters.
He also found a string $S'$, which turns out to be the string $S$ with some of its letters (possibly all or none) replaced with ?.

One more thing he found is a sheet of paper with the following facts written on it:

• Condition 1: The string $S$ contains a string $T$ as a contiguous substring.
• Condition 2: $S$ is the lexicographically smallest string among the ones that satisfy Condition 1.

Print the string $S$.
If such a string does not exist, print UNRESTORABLE.

Constraints

• $1 \leq |S'|, |T| \leq 50$
• $S'$ consists of lowercase English letters and ?.
• $T$ consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

$S$
$T'$

Output

Print the string $S$.
If such a string does not exist, print UNRESTORABLE instead.

Sample Input 1

?tc????
coder

Sample Output 1

atcoder

There are $26$ strings that satisfy Condition 1: atcoder, btcoder, ctcoder,..., ztcoder. Among them, the lexicographically smallest is atcoder, so we can say $S = $atcoder.

Sample Input 2

??p??d??
abc

Sample Output 2

UNRESTORABLE

There is no string that satisfies Condition 1, so the string $S$ does not exist.