program algoritmul_lui_euclid;
var f,g:text;
a,b,t,i,r:longword;
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);
        if a<b then begin
                while b>0 do begin r:=b; b:=a mod b; a:=r; end; writeln(g,a); end
               else begin
                while a>0 do begin r:=a; a:=b mod a; b:=r; end; writeln(g,b); end;
        end;
close(f); close(g);
end.