var x1_,x2_,y1_,y2_:byte;

 procedure ProverKa1(x1, x2, y1, y2 : byte);
  begin
     x1 := (x1 mod 2) + (y1 mod 2);
     x2 := (x2 mod 2) + (y2 mod 2);
     if (x1=x2) or (x1-x2=2) or (x1-x2=-2) then writeln('a) ODNOGO CVETA')
     else writeln('a) rasnogo');
  end;

 procedure ProverKa2(x1, x2, y1, y2 : byte);
  begin
     if (x1 = x2) or (y1 = y2) then writeln('b) BIET') else
     if (x1 - y1) = (x2 - y2) then writeln('b) BIET') else
     if (x1 + y1) = (x2 + y2) then writeln('b) BIET') else
     writeln('b) Ne biet');
  end;

 procedure ProverKa3(x1,x2,y1,y2 : byte);
  begin
     if (x1 - x2 = 1) and (y1 - y2 = -2) then writeln('c) BIET') else
     if (x1 - x2 = -1) and (y1 - y2 = -2) then writeln('c) BIET') else
     if (x1 - x2 = -2) and (y1 - y2 = -1) then writeln('c) BIET') else
     if (x1 - x2 = -2) and (y1 - y2 = 1) then writeln('c) BIET') else
     if (x1 - x2 = -1) and (y1 - y2 = 2) then writeln('c) BIET') else
     if (x1 - x2 = 1) and (y1 - y2 = 2) then writeln('c) BIET') else
     if (x1 - x2 = 2) and (y1 - y2 = 1) then writeln('c) BIET') else
     if (x1 - x2 = 2) and (y1 - y2 = -1) then writeln('c) BIET') else
     writeln('c) Ne biet');
  end;

begin
  readln(x1_,x2_,y1_,y2_);
  ProverKa1(x1_,x2_,y1_,y2_);
  ProverKa2(x1_,x2_,y1_,y2_);
  ProverKa3(x1_,x2_,y1_,y2_);
  readln;
end.

begin
       if abs(x1 - x2) * abs(y1 - y2) = 2 then writeln('c) BIET')
end;