import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
class IO7 {
public static void main(String[] args) {
File file = new File("I:\\bb.txt");
BufferedReader bufr = null;
try {
bufr = new BufferedReader(new FileReader(file));
int ch = 0;
int count = 0;
while ((ch = bufr.read()) != -1) {
if (ch == 97 || ch == 65)
count++;
}
System.out.println(count);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (bufr != null) {
bufr.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}