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=io.read()
T=io.read()
local s=#S
local t=#T
local res=false
local q=0
local news
local ans
while s>=t do
    if string.sub(S,s,s)=="?" or string.sub(S,s,s)==string.sub(T,t,t) then
        t=t-1
        if t==0 then
            q=s
            res=true
            news=string.sub(S,1,q-1)..T..string.sub(S,q+#T,#S)
            ans=string.gsub(news,"?","a")
            print(ans)
        end
        if string.sub(S,s-1,s-1)~="?" and string.sub(S,s-1,s-1)~=string.sub(T,t,t) then
      		s=s+#T-t-1
            t=#T
        end
    end
    s=s-1
    if res==true then
        break
    end
end
if res==false then
    print("UNRESTORABLE")
end