import java.util.regex.Pattern;

class App {
static public void main(String[] args) {
String pattern = "a+[bc]*";

int i = 0;
i += Pattern.matches(pattern, "aaaaab")? 1 : 0;
i += Pattern.matches(pattern, "a")? 1 : 0;
i += Pattern.matches(pattern, "bcbc")? 1 : 0;
i += Pattern.matches(pattern, "aacccc")? 1 : 0;
i += Pattern.matches(pattern, "cbbbc")? 1 : 0;

System.out.println(i);
}
}