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: Wrong Answer)

package main

import (
  "fmt"
)
var str, t string
var quest []int

func check(idx int) bool {
  if len(str) - idx < len(t) {
    return false
  }
  for i := idx; i < idx + len(t); i++{
    if str[i] != t[i-idx] && str[i] != '?' {
      return false
    }
  }
  return true
}

func main() {
  fmt.Scanf("%s\n%s", &str, &t)
  if str == t {
    fmt.Println(str)
    return
  }

  quest = make([]int, len(str))
  cnt := 0
  for i := len(str) - 1; i >= 0; i-- {
    if str[i] != '?' {
      cnt = 0
    } else {
      cnt += 1
      quest[i] = cnt
    }
  }
  idx := -1
  for i := 0; i < len(str); i++ {
    if(check(i)) {
      idx = i
    }
  }
  if idx == -1 {
    fmt.Println("UNRESTORABLE")
  } else {
    for i := 0; i < len(str); i++ {
      if i == idx {
        fmt.Print(t)
        i += len(t)
      } else if str[i] == '?' {
        fmt.Print("a")
      } else {
        fmt.Print(string(str[i]))
      }
    }
    fmt.Println()
  }

}