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 PHP7 (7.0.15) (judge verdict: Accepted)

<?php
list($_s) = strs();
list($t) = strs();
$len_s = strlen($_s);
$len_t = strlen($t);
for ($i = $len_s - $len_t; $i >= 0; --$i) {
    $_sub = substr($_s, $i, $len_s);
    $flag = true;
    for ($j = 0; $j < $len_t; ++$j) {
        if ($_sub[$j] !== '?' && $_sub[$j] !== $t[$j]) {
            $flag = false;
            break;
        }
    }
    if ($flag) {
        $_s = substr_replace($_s, $t, $i, $len_t);
        $_s = str_replace('?', 'a', $_s);
        echo $_s;
        exit;
    }
}
echo 'UNRESTORABLE';
function strs()
{
    return explode(' ', trim(fgets(STDIN)));
}