for(;a=readline(b={}).split(/\D/),$=+a[0];print(b[$]||'-'))for(q=[i=0];t=q[i++],t>=0;)for(j=t<$;c=+a[++j];b[u=c+t]?1:b[u]=q.push(u)&&_?_+' '+c:c)_=b[t]
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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