uses crt;
const
 n=10;
var
 i,T:integer;
 a:array [1..n] of integer;

function Sign(s:integer):integer;
begin
 if s<0 then Sign:=-1 else Sign:=1;
end;

begin
 clrscr;
 randomize;
 for i:=1 to n do
  begin
   repeat
    a[i]:=10-random(21);
   until a[i]<>0;
   write(a[i]:5);
  end;
 writeln;
 T:=0;
 for i:=1 to n-1 do
  if Sign(a[i])<>Sign(a[i+1]) then Inc(T);
 writeln('Sign changes ',T,' times');
 readln;
end.