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 PyPy3 (2.4.0) (judge verdict: Accepted)


def solve():
    input_string = input()
    part_string = input()

    for i in range(len(input_string) - len(part_string), -1, -1):
        possible_part_string = input_string[i:i+len(part_string)]  # part_stringの可能性のある文字列
        for j in range(len(part_string) + 1):  # 1つ多くループしているのは最後の処理のため
            if j == len(part_string):
                result = input_string[:i] + part_string + input_string[i + len(part_string):]
                result = result.replace("?", "a")
                print(result)
                return  # 今回のテストケースの終了
            if possible_part_string[j] == "?" or possible_part_string[j] == part_string[j]:
                continue
            else:  # 再度ずらして探索する
                break

    print("UNRESTORABLE")
solve()