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