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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <iostream>
#include <string>

using namespace std;

int main(int argc, const char *argv[])
{
	string S, T;

	cin >> S >> T;

	int a = S.size(), b = T.size();

	for (int i = a - b; i >= 0; i--) {
		bool unrestorable;
		for (int j = 0; j < b; j++) {
			if (S[i + j] != T[j] && S[i + j] != '?') {
                unrestorable = true;
                break;
            }
		}
		if (unrestorable) continue;

		for (int j = 0; j < b; j++) {
			S[i + j] = T[j];
		}

		for (int j = 0; j < a; j++) {
			if (S[j] == '?') S[j] = 'a';
		}

		cout << S << endl;
		return 0;
	}

	cout << "UNRESTORABLE" << endl;

	return 0;
}