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 Python (3.4.3) (judge verdict: Wrong Answer)

S = list(input())
T = list(input())

index = len(S)
ans = []
isMatch = True

# 後ろから判定
while index - len(T) >= 0:
  obj = S[index - len(T):index]
  # 切り出した文字列がTと一致し得るか判定
  for i in range(len(obj)):
    if not obj[i] == "?" and not obj[i] == T[i]:
      isMatch = False
      break
  
  # T文字列で埋める
  if isMatch:
    ans.append(S[0:index-len(T)] + T + S[index:])

  isMatch = True
  index = index - 1

if ans == []:
  print("UNRESTORABLE")
else:
  ans = sorted(ans)[0]
  for i in range(len(ans)):
    if ans[i] == "?":
      ans[i] = "a"
      print("".join(ans))