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 Go (1.6) (judge verdict: Accepted)

package main

import (
	"fmt"
)

func main() {
	var S, T string
	fmt.Scan(&S, &T)

	index := -1
	for i := range S {
		var j int
		for ; j < len(T); j++ {
			if i+j < len(S) && (S[i+j] == '?' || S[i+j] == T[j]) {
			} else {
				break
			}
		}

		if j == len(T) {
			index = i
		}
	}

	if index == -1 {
		fmt.Println("UNRESTORABLE")
	} else {
		s := S[:index] + T + S[index+len(T):]
		for i := range s {
			if s[i] == '?' {
				fmt.Print("a")
			} else {
				fmt.Print(string(s[i]))
			}
		}
		fmt.Println()
	}

}