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 Fortran (GNU Fortran 9.2.1) (judge verdict: Accepted)

program sample
    implicit none
    character(100)::s,t,ans
    integer(8) :: i,j,k,m,n
    integer(8)::a,b,c,d
    integer(8),allocatable::x(:),y(:)
  
    read(*,*) s
    read(*,*)t
    n=len_trim(s)
    m=len_trim(t)
    if(m>n)then
        write(*,*)'UNRESTORABLE'
        stop
    end if
    a=-1
    do i=n,m,-1
        do j=m,1,-1
            if(s(i-m+j:i-m+j) .ne. t(j:j) .and. s(i-m+j:i-m+j) .ne. '?')then
                exit
            elseif(j==1)then
                a=i-m
                s(i-m+1:i)=t
            end if
        end do
        if(a>=0)then
            exit
        elseif(a==-1 .and. i==m)then
            write(*,*)'UNRESTORABLE'
            stop
        end if
    end do
    do i=1,n
        if(s(i:i) .eq. '?')then
            s(i:i)='a'
        end if
    end do
    write(*,*)s
    stop
end program sample