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: Wrong Answer)

<?php

ini_set('error_reporting', E_ALL & ~E_NOTICE & ~E_WARNING);
ini_set('display_errors', 'Off');

// define('DEBUG', true);
define('DEBUG', false);

fscanf(STDIN, "%s", $S);
fscanf(STDIN, "%s", $T);

$arrS = str_split($S);
$arrT = str_split($T);

for ($i = count($arrS) - count($arrT); $i >= 0; $i--) {
    if (DEBUG) echo "i:{$i}\n";
    $tmpS = $arrS;
    $tmpT = $arrT;
    $flg = true;
    for ($j = 0; $j < count($arrT); $j++) {
        if (DEBUG) echo "{$i} {$j} {$arrT[$j]} {$arrS[$i + $j]}\n";
        if ($arrT[$j] == $arrS[$i + $j] || "?" == $arrS[$i + $j]) {

        } else {
            $flg = false;
        }
    }
    if (DEBUG) var_dump($flg);
    if ($flg) {
        $newStr = substr($S, 0, $i);
        $newStr .= $T;
        $newStr .= substr($S, strlen($newStr));     
        $newStr = str_replace("?", "a", $newStr);
        echo $newStr . PHP_EOL;
        exit;
    } else {
    }
}
echo "X\n";
echo "UNRESTORABLE\n";