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.

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.

Constraints

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

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.

见题面 Input 部分

见题面 Output 部分