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#include <bits/stdc++.h>
using namespace std;
string st;
int d,i,dem;
int main()
{
freopen("xau.inp","r",stdin);
freopen("xau.out","w",stdout);
cin>>st;
d=st.length();
dem=0;
for (i=0; i<=d-1; i++)
if (st[i]=='a') dem++;
cout<<dem;
return 0;
}
const fi='inp.inp';
fo='out.inp';
var f1,f2:text;
st:array[1..100]of string;
i,n:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
n:=0;
while not eof(f1) do
begin
n:=n+1;
readln(f1,st[n]);
end;
for i:=1 to n do
writeln(f2,length(st[i]));
close(f1);
close(f2);
end.
const fi='kt.txt';
fo='kq.out';
var f1,f2:text;
s:string;
i,dem,d:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,s);
vt:=pos('anh',s);
while vt<>0 do
begin
delete(s,vt,3);
insert(s,vt,'em');
vt:=pos('anh',s);
end;
writeln(f2,s);
close(f1);
close(f2);
end.
uses crt;
const fi='vanban.txt';
fo='kq.txt';
var f1,f2:text;
st:string;
i,d,dem,k,dem1,x,y,dem2,kt,e:integer;
j:char;
a,b:array[1..100]of integer;
begin
clrscr;
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,st);
{---------------------cau-a------------------}
d:=length(st);
dem:=0; dem1:=0;
for i:=1 to d do
for j:='0' to '9' do
if st[i]=j then
begin
inc(dem);
val(st[i],x,y);
inc(dem1);
a[dem1]:=x;
end;
writeln(dem);
{------------cau-b------------------}
b[1]:=a[1];
dem2:=1;
for k:=1 to dem1 do
begin
kt:=0;
for e:=1 to dem2 do
if a[k]=b[e] then kt:=1;
if kt=0 then begin
inc(dem2);
b[dem2]:=a[k];
end;
end;
for k:=1 to dem2 do write(f2,b[k]:4);
close(f1);
close(f2);
readln;
end.