import std.stdio;void main(){int[10]a;for(int*p=&*a,q=p;~scanf("%d",p++);)if(getchar%4){for(*p=0;q<p?1:--p>(q=&*a);)*q++=q[1]-*q;writeln(-*p);}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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