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 a = io.read()
local b = io.read()
local alen, blen = #a, #b
local ret = nil

for i = 1, alen + 1 - blen do
  local accept = true
  for j = i, i + blen - 1 do
    local jb = j - i + 1
    local as, bs = a:sub(j, j), b:sub(jb, jb)
    if as ~= "?" and as ~= bs then
      accept = false break
    end
  end
  if accept then
    local str = ""
    for j = 1, alen do
      local jb = j - i + 1
      if jb < 1 or blen < jb then
        local as = a:sub(j, j)
        if as == "?" then as = "a" end
        str = str .. as
      else
        str = str .. b:sub(jb, jb)
      end
    end
    if not ret then
      ret = str
    elseif str < ret then
      ret = str
    end
  end
end
if not ret then print("UNRESTORABLE")
else print(ret) end