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 JavaScript (node.js v5.12) (judge verdict: Accepted)

"use strict";
    
const main = arg => {
    arg = arg.trim().split("\n");
    const S = arg[0];
    const T = arg[1];
    
    for(let i=S.length - T.length; i>=0; i--) {
        let flag = true;
        let sub  = S.substr(i, T.length);
 
        for(let j=0; j<T.length; j++) {
            if(sub.charAt(j) !== T.charAt(j) && sub.charAt(j) !== "?") {
                flag = false;
                break;
            }
        }
        
        if(flag === true) {
            let answer = S.substring(0, i) + T + S.substring(parseInt(i) + T.length);
            answer = answer.replace(/\?/g, "a");
            console.log(answer);
            return;
        }
    }
    
    console.log("UNRESTORABLE");
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));