program p1135;
var a,b,n:integer;
    i:longint;
    m1:string[1];
begin
  readln(n);
  while not eof do
  begin
    read(m1);
    if (m1='<')or(m1='>') then a:=a+1;
    if m1='<' then
    begin
      b:=b+1;
      i:=i+a-b;
    end;
    if eoln then
    begin
      readln;
      a:=0;
      b:=0;
    end;
  end;
  writeln(i);
end.

If the process is infinite then the program should write the
word &#8220;NO&#8221; to the output file.

the proccess can not be infinite

Do not null "A" and "B"