Set symmetric difference by murky-satyr

for(o='',a=((r=readline)(s=' ')+s+r(i=0)).split(s).sort();x=a[i];)x!=a[i-1]&x!=a[++i]?o+=x+s:0
print(o)

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

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