var
S: String;
f: real;
count, i: integer;
begin
readln(S);
for i := 0 to Length(S) do
if S[i] = ' ' then inc(count);
writeln(count * 100 / Length(S));
end;
var
S: String;
f: real;
count, i: integer;
begin
readln(S);
for i := 0 to Length(S) do
if S[i] = ' ' then inc(count);
writeln(count * 100 / Length(S));
end;