z;a[2000];*p=a+20;main(x,y){for(;scanf("%c%d ",&x,&y)<0?z%20*!*p++&&p[-2]+*p+p[-21]+p[19]&&printf("%c%d\n",z/20+z/1460,z%20),++z<1680:++p[20*(x-x/73)+y];);}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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