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));

for($i = 0; $i <= strlen($s) - strlen($t); $i++){
    $flag = true;
    for($j = 0; $j < strlen($t); $j++){
        if($s[$i+$j] == $t[$j] || $s[$i+$j] == "?"){
            //ok
        }else{
            $flag = false;
        }
    }
    if($flag){
        $str = "";
        for($j = 0; $j < strlen($s); $j++){
            if($j >= $i && $j < $i + strlen($t)){
                $str.= $t[$j-$i];
            }else{
                if($s[$j] == "?"){
                    $str.= "a";
                }else{
                    $str.= $s[$j];
                }
            }
        }
        $ret[] = $str;
    }
}
if(isset($ret)){
    sort($ret);
    echo $ret[0];
}else{
    echo "UNRESTORABLE";
}