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 C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;

int main(){
  string s,t;
  cin >> s >> t;
  bool flag = false;
  int p;
  for(int i=0; i<s.size()-t.size()+1; i++){
    string ssub = s.substr(i,t.size());
    for(int j=0; j<t.size(); j++){
      if(ssub.at(j)==t.at(j)||ssub.at(j)=='?'){
        flag = true;}
      if(ssub.at(j)!=t.at(j)&&ssub.at(j)!='?'){
        flag = false;
        goto end;}
    }
    p = i;
    end :
    int dummy = 1;
  }
  if(flag){
    for(int i=0; i<s.size(); i++){
      if(i==p){
        cout << t << endl;
        i += t.size()-1;
      }else{
        if(s.at(i)=='?'){
          cout << 'a';
        }else{
          cout << s.at(i);
        }
      }
    }
    cout << endl;
  }else{
    cout << "UNRESTORABLE" << endl;
  }
}