program euclid;
var
    a,b,i,n,r:longint;
    fin,fout:text;
begin
    assign(fin,'euclid2.in');reset(fin);
    assign(fout,'euclid2.out');rewrite(fout);
    readln(fin,n);
    for i:=1 to n do
        begin
        readln(fin,a,b);
        repeat
            r:=a mod b;
            a:= b;
            b:= r;
        until r=0;
        writeln(fout,a);
        end;
    close(fin);
    close(fout);
end.
{var
    f,g:text;
    n,i,a,b,r:longint;
begin
    assign(F,'euclid2.in');reset(f);
    assign(g,'euclid2.out');rewrite(g);
    readln(f,n);
    for i:=1 to n do
        begin
        readln(f,a,b);
        repeat
            r:=a mod b;
            a:=b;
            b:=r;
        until r=0;
        writeln(g,a);
        end;
    close(F);close(g);
end.

 }