while~0: *a,=map(set,input().split()) for(_)in a: for(s)in a:_-={'-'};s|=s&_ and _ S=sorted;x,*_,y=S(a,key=len);print(*S(x)+[' ']+S(y),sep="")
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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