{int @a,@b,@c;int m=min(a,b)*2,x=a-c/2,y=b-c/2;if(m<c||(m==c&&a==b)||(!c&&m))wt(-1);else if(!m){rep(a)wtN(0);rep(b)wtN(1);}else if(m==c){rep(i,c)wtN((i+(b>a))%2);rep(max(x,y))wtN(b>a);}else{rep(x)wtN(0);rep(i,1,c)wtN(i%2);rep(y)wtN(1);if(!(c%2))wtN(0);}}