var a,b,i,n:longint; f1,f2:text;
function gcd(a,b:integer):longint;
var aux:integer;
begin
while b<>0 do begin
aux:=b;
b:=a mod b;
a:=aux;
end;
gcd:=a;
end;
begin
assign(f1,'euclid2.in');
reset(f1);
assign(f2,'euclid2.out');
rewrite(f2);
readln(f1,n);
for i:=1 to n do begin
readln(f1,a,b);
writeln(f2,gcd(a,b));
end;
close(f1);
close(f2);
end.