program euclid;
var f,g:text;
		a,b,i,n:longint;
begin
assign(f,'euclid2.in');reset(f);assign(g,'euclid2.out');rewrite(g);
read(f,n);
for i:=1 to n do
	begin
	read(f,a);read(f,b);
	while a<>b do
		 if a>b then a:=a-b
		 else b:=b-a;
	writeln(g,a);
	end;
close(f);close(g);
end.