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 (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
#include<string.h>
int main()
{
	char s[200000];
	char t[100];
	scanf("%s", s);
	scanf("%s", t);
	int aim;
	int ls, lt,i,flag=0;
	ls = strlen(s);
	lt = strlen(t);
	for (aim = ls - lt; aim > -1; aim--)
	{
		if (!flag)
		{
			flag = 1;
			for (i = 0; i < lt; i++)
			{
				if (s[aim + i] != '?'&&s[aim + i] != t[i])
				{
					flag = 0;
					break;
				}
			}
		}
		else
			break;
	}
	aim++;
	if (flag)
	{
		for (i = 0; i < aim; i++)
		{
			if (s[i] == '?')
				printf("a");
			else
				printf("%c", s[i]);
		}
		printf("%s", t);
		for (i = aim + lt; i < ls; i++)
		{
			if (s[i] == '?')
				printf("a");
			else
				printf("%c",s[i]);
		}
	}
	else
		printf("UNRESTORABLE");
	return 0;
}