import java.util.Scanner;

public class Main {
    public static void main(String args[]) {
        try (Scanner in = new Scanner(System.in)) {
            String s = in.next();
            System.out.println(s.lastIndexOf("Z") - s.indexOf("A") + 1);
        }
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String args[]) {
        try (Scanner in = new Scanner(System.in)) {
            String s = in.next();
            System.out.println(s.lastIndexOf("Z") - s.indexOf("A") + 1);
        }
    }
} Main public static void main(String args[]) {
        try (Scanner in = new Scanner(System.in)) {
            String s = in.next();
            System.out.println(s.lastIndexOf("Z") - s.indexOf("A") + 1);
        }
    } main {
        try (Scanner in = new Scanner(System.in)) {
            String s = in.next();
            System.out.println(s.lastIndexOf("Z") - s.indexOf("A") + 1);
        }
    } try (Scanner in = new Scanner(System.in)) {
            String s = in.next();
            System.out.println(s.lastIndexOf("Z") - s.indexOf("A") + 1);
        } {
            String s = in.next();
            System.out.println(s.lastIndexOf("Z") - s.indexOf("A") + 1);
        } Scanner in = new Scanner(System.in) Scanner in = new Scanner(System.in) new Scanner(System.in) String s = in.next(); s in.next() in.next in System.out.println(s.lastIndexOf("Z") - s.indexOf("A") + 1) System.out.println System.out System System.out s.lastIndexOf("Z") - s.indexOf("A") + 1 s.lastIndexOf("Z") - s.indexOf("A") s.lastIndexOf("Z") s.lastIndexOf s "Z" s.indexOf("A") s.indexOf s "A" 1 String args[] args public class Main {
    public static void main(String args[]) {
        try (Scanner in = new Scanner(System.in)) {
            String s = in.next();
            System.out.println(s.lastIndexOf("Z") - s.indexOf("A") + 1);
        }
    }
} public class Main {
    public static void main(String args[]) {
        try (Scanner in = new Scanner(System.in)) {
            String s = in.next();
            System.out.println(s.lastIndexOf("Z") - s.indexOf("A") + 1);
        }
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String args[]) {
        try (Scanner in = new Scanner(System.in)) {
            String s = in.next();
            System.out.println(s.lastIndexOf("Z") - s.indexOf("A") + 1);
        }
    }
}
