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 C# (.NET Core 3.1.201) (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Numerics;
 
class Program
{
    static void Main()
    {
        var _S = Console.ReadLine().ToCharArray();
        var T = Console.ReadLine();
        var matches = 0;
        var last = -1;
        for (int i = 0; i < _S.Length; i++)
        {
            if (last == -1 && matches < T.Length) if (_S[i] == '?' || _S[i] == T[matches]) matches++;
            else matches = 0;
            if (last == -1 && matches == T.Length) last = i;
        }
        if (last != -1)
        {
            for (int i = 0; i < T.Length; i++)
            {
                _S[last - i] = T[T.Length - 1 - i];
            }
            Console.WriteLine(new string(_S).Replace('?', 'a'));
        }
        else Console.WriteLine("UNRESTORABLE");
    }
}