program cmmdc;
var a,b,r,t,i:Longint;
    f,g:text;
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);
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.