Set symmetric difference by 51b

n;s[];*m=s;strcmp();main(){for(;!~scanf("%s",s+n)?*m-m[1]?printf("%s ",m):m++,++m<s+n:++n;)qsort(s,n,4,strcmp);}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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