program euclid_extins;
var a,b,r,t,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);
 r:=a mod b;
 while r<>0 do
 begin
  a:=b;
  b:=r;
  r:=a mod b;
 end;
 writeln(g,b);
end;
close(f); close(g);
end.