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 Python (3.8.2) (judge verdict: Accepted)

S = input()
T = input()

if len(S) < len(T):
    print("UNRESTORABLE")
    exit()

##一つ一つパターンマッチさせる

ls = len(S)
lt = len(T)
index = -1
for i in range(ls-lt+1):
    cnd = S[i:i+lt]
    flag = True
    for s,t in zip(cnd,T):
        if s != "?":
            if s != t:
                flag = False
                break

    if flag:
        index = i


if index == -1:
    print("UNRESTORABLE") 
else:
    tmp = S.replace("?","a")
    print(tmp[:index]+T+tmp[index+lt:])