program exhibit;
var
  t:array [1..1000000] of integer;
  j,i,min,mina,minb,n,m:longint;
  b:array [1..2000] of boolean;
function check:boolean;
var i:integer;
begin
	check:=true;
	for i:=1 to m do if b[i]=false then begin
		check:=false;
	    break;
	end;
end;
begin
  fillchar (b,sizeof(b),0);
  assign (input,'exhibit.in');
  reset (input);
  readln (n,m);
  for i:=1 to n do read (t[i]);
  close (input);
  assign (output,'exhibit.out');
  rewrite (output);
  i:=1;min:=maxlongint;
  for j:=1 to n do begin
    if b[t[j]]=false then begin
	  b[t[j]]:=true;
	  if (check) and (j-i+1<min) then begin
	     min:=j-i+1;
		 mina:=i;minb:=j;
	  end;
    end
	else if t[j]=t[i] then inc(i);
  end;
  writeln (mina,' ',minb);
  close (output);
end.