Problem:
Score : 300 points

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.

Solution in Perl (v5.18.2) (judge verdict: Wrong Answer)

#!/usr/bin/perl

$line = 0;
while(<>) {
    chomp;
    if ($line == 0) {
        $sd = $_;
        @sd = split //, $_;
    } else {
        $t = $_;
        @t = split //, $_;
    }
    $line++;
}

$repm = 100;
$done = 0;
$flag = 0;
$cnt = $#sd;
foreach (reverse @sd) {
    if ($flag) {
        if ($#temp < 0) {
            $done = 1;
            if ($repm > $rep) {
                $repm = $rep;
                $done1 = $cnt;
            }
            $flag = 0;
        } else {
            $w = pop @temp;
            if ($_ ne '?') {
                if ($_ ne $w) {
                    $flag = 0;
                }
            } else {
                $rep++;
            }
        }
    } elsif ($_ eq '?') {
        $flag = 1;
        $rep = 0;
        @temp = @t;
        pop @temp;
        $rep++;
    }
    $cnt--;
}

if ($done) {
    substr($sd, $done1 + 1, $#t + 1, $t);
    $sd =~ s/\?/a/g;
    print "$sd\n";
} else {
    print "UNRESTORABLE\n";
}