{Program Euclid;
var A,B,C,i,t: Longint;
f,g: text;
begin
assign(f,'euclid2.in');
assign(g,'euclid2.out');
reset(f);
rewrite(g);
read(f,T);
if A < B then begin
 C:= A;
 A:= B;
 B:= C;
 end;
for i:=1 to t do begin 
 read(f,A,B);
 while B <> 0 do begin
  C:= A mod B;
  A:= B;
  B:= C;
  end;
 writeln(g,A);
end;
 close(f);
 close(g);
end.}
var f,g:text;
    t,i,a,b,r:longint;
begin
assign(f,'euclid2.in');reset(f);
assign(g,'euclid2.out');rewrite(g);
readln(f,t);
for i:=1 to t do
 begin
  readln(f,a,b);
  if a<b then begin r:=a;a:=b;b:=r;end;
  repeat
   r:=a mod b;
   a:=b;
   b:=r;
  until r=0;
  writeln(g,a);
 end;
close(f);
close(g);
end.