main(a,b,c,d,t){for(;~scanf("%d %d %d %d\n",&a,&b,&c,&d);puts(""))for(;vprintf()-8|d;b=abs(b-c),c=abs(c-d),d=abs(d-a),a=t)t=abs(a-b);}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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