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

$s = trim(fgets(STDIN));
$t = trim(fgets(STDIN));

$s_len = strlen($s);
$t_len = strlen($t);

$repeat = $s_len - $t_len+1;
$flg = false;
for ($i=0; $i < $repeat ; $i++) { 
	$s_end = $s_len-$i-1;
	for ($j=0; $j < $t_len ; $j++) { 
		$cur_s = $s[$s_end-$j];
		$cur_t = $t[$t_len-$j-1];
		if ($cur_s !== $cur_t && ($cur_s !== '?')){
			break;
		}
		if ($j === $t_len-1) {
			$flg = true;
			for ($k=0; $k < $t_len ; $k++) { 
				$s[$s_end-$k] = $t[$t_len-$k-1];
			}
		}
	}
	if ($flg) {
		break;
	}
}

if ($flg) {
	for ($i=0; $i < $s_len; $i++) { 
		$tmp = $s[$i];
		if ($tmp === '?') {
			echo 'a';
		}else{
			echo $tmp;
		}
	}
}else{
	echo 'UNRESTORABLE';
}