var
l, m, i: integer;
s: string;
begin
readln(s);
l := 0;
m := 0;
for i := 1 to Length(s) do
if s[i] in ['0' .. '9'] then
Inc(l)
else
begin
if l > m then
m := l;
l := 0
end;
writeln('max digital sequence length is ', m);
end.