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