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 Lua (5.3.2) (judge verdict: Accepted)

s, t = io.read('*l'), io.read('*l')

ans = nil

for i = 1, #s - #t + 1 do
    local ss = s:sub(1, i - 1) .. t .. s:sub(i + #t)
    local valid = true
    for j = 1, #s do
        if s:byte(j) ~= 63 and s:byte(j) ~= ss:byte(j) then
            valid = false; break
        end
    end
    if valid then
        local t = ss:gsub('?', 'a')
        if ans == nil or ans > t then ans = t end
    end
end

print(ans or 'UNRESTORABLE')