bettinggame.java

import java.util.Scanner;

public class bettinggame {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        // taking input
        String s = sc.nextLine();

        int value = 10;
        int bet = 1;

        if (s.length() < 20) {
            for (int i = 0; i < s.length(); i++) {
                if (s.charAt(i) == 'W') {
                    value += bet;
                    if (bet > 1) {
                        bet /= 2;
                    }
                } else {
                    value = value - bet;
                    bet *= 2;
                }
                if (value <= 0 || bet > value) {
                    System.out.println(-1);
                }
                if (i == s.length() - 1) {
                    System.out.println(value);
                    bet = 1;
                }
            }
        }
        sc.close();
    }
}