#include<bits/stdc++.h>
using namespace std;
string s;
int len,sum;
int main(){
    cin>>s;
    len=s.length();
    for(int i=0;i<len;i++){
        if(s[i]=='a'||s[i]=='A'){
            sum++;
        }
    }
    cout<<sum;
    return 0;
}

s=input()
num=0
for c in s:
    if c=='a' or c=='A':
        num+=1
print(num)

string = str(input())
time = 0
for i in string:
    if i == "#":
        break
    if i == "a" or i == "A":
        time += 1
print(time)

s=input()
b=0
for c in s:
    if c=='a' or c=='A' :
        b+=1
print(b)

a=input() b=0 for c in a: if c=='a' or c=='A': b+=1 print(b)