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 Julia (0.5.0) (judge verdict: Accepted)

parseInt(x) = parse(Int, x)
parseMap(x::Array{SubString{String},1}) = map(parseInt, x)

function main()
	s = chomp(readline())
	t = chomp(readline())
	ls = length(s)
	lt = length(t)
	gflg = 0
	initial = 0
	for i in 0:ls-lt
		lflg = 0
		for j in 1:lt
			if s[ls-lt-i+j] != t[j] && s[ls-lt-i+j] != '?'
				lflg = 1
				break
			end
		end
		if lflg == 0
			initial = ls-lt-i+1
			gflg = 1
			break
		end
	end
	if gflg == 0
		println("UNRESTORABLE")
	else
		for i in 1:initial-1
			if s[i] == '?'
				print('a')
			else
				print(s[i])
			end
		end
		print(t)
		for i in initial+lt:ls
			if s[i] == '?'
				print('a')
			else
				print(s[i])
			end
		end
	end
end

main()