program project1;
var
  ans,s1,i,s2,t,y,m,d,date:integer;
function f(x,m,d:integer):boolean;
begin
     f:=true;
     if (m>12)or(m<1)then f:=false;
     if (d>31)or(d<1)then f:=false;
     case m of
      4,6,9,11:if d=31 then f:=false;
      2: if d=30 then f:=false;
     end;
end;
begin
  readln(s1);
  readln(s2);
  ans:=0;
  t:=(s2 div 10000)-(s1 div 10000)+1;
  for i:=1 to t do
   begin
     y:=s1 div 10000+i-1;
     m:=(y mod 10)*10+(y div 10 mod 10);
     d:=(y div 100 mod 10)*10+(y div 1000);
     date:=y*10000+m*100+d;
     if (date>=s1) and(date<=s2) then
      if f(y,m,d)=true then inc(ans);
   end;
  writeln(ans);
  readln;
  readln;
end.