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)

local S, T = io.read("l","l")
local function match(i)
    local ss = S:sub(i, i+#T-1)
    for k=1,#T do
        local c = ss:sub(k,k)
        local d = T:sub(k,k)
        if c == '?' then
        elseif c == d then
        else
            return false
        end
    end
    return true
end
for i=#S-#T+1,1,-1 do
    if match(i) then
        local t = {}
        for k=1,i-1 do
            local c = S:sub(k,k)
            if c == '?' then
                table.insert(t, 'a')
            else
                table.insert(t, c)
            end
        end
        for k=i,i+#T-1 do
            table.insert(t, T:sub(k-i+1,k-i+1))
        end
        for k=i+#T,#S do
            local c = S:sub(k,k)
            if c == '?' then
                table.insert(t, 'a')
            else
                table.insert(t, c)
            end
        end
        print(table.concat(t, ""))
        return
    end
end
print("UNRESTORABLE")