program euclid;
var t,a,b,i:longint;
     f,g:text;
begin
assign(f,'euclid2.in');
assign(g,'euclid2.out');
reset(f);
rewrite(g);
readln(f,t);
for i:=1 to t do
   begin
   readln(f,a,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.