uses crt;
var n:integer;
begin
clrscr;
write('Nhap N=');readln(n);
if n>0 then write('So ',n,' la so duong')
else write('So ',n,' la so am');
readln;
end.
uses crt;
var a:integer;
begin
clrscr;
write('a='); readln(a);
if a<>0 then
begin
if a>0 then writeln(a,' la so duong')
else writeln(a,' la so am');
end
else writeln('vui long nhap lai');
readln;
end.