program  text11;
var f,g:text;
    d:longint;
    a,y:char;
    {c:set of 'A'..'z';       }
    h,l:real;
    p:boolean;
    begin
l:=0;h:=0; d:=0;
assign(f,'text.in'); reset(f);
assign(g,'text.out'); rewrite(g);
y:=' ';
if not eof(f) then
begin
while not eof(f) do
        begin
        read(f,a);
        if (ord(a)>=65) and (ord(a)<=127) then
        begin
        p:=true;
        end
        else
        if (ord(y)>=65) and (ord(y)<=127) then
                                          d:=d+1;
        y:=a;
        end;
        if p=true then
        begin
        a:=' ';
if (ord(y)>=65) and (ord(y)<=127) then
                                          d:=d+1;
close(f);reset(f);
while not eof(f) do
        begin
        read(f,a);
        if (ord(a)>=65) and (ord(a)<=127) then
        {if (ord(y)>=65) and (ord(y)<=127) then}
        l:=l+1;
        if trunc(l) mod 100000=0 then
                                 begin
                                 l:=l/d;
                                 h:=h+l;
                                 l:=0;
                                 end;
        end;
        h:=h+l/d;
        writeln(g,trunc(h));
        end
        else
        writeln(g,'0');
end
else
writeln(g,'0');
close(f); close(g);
end.