Score : 300 points
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:
Print the string S.
If such a string does not exist, print UNRESTORABLE
.
?
.Input is given from Standard Input in the following format:
S T'
Print the string S.
If such a string does not exist, print UNRESTORABLE
instead.
?tc???? coder
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
.
??p??d?? abc
UNRESTORABLE
There is no string that satisfies Condition 1, so the string S does not exist.