StrToNum.java

import java.util.Scanner;

public class StrToNum {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.nextLine();
        int sum = 0;

        if(s.length() < 0) {
            System.out.println(sum);
        }
    
        for(int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            switch (c) {
                case 'A':
                    sum += 1;
                    break;
                case 'B':
                    sum += 10;
                    break;
                case 'C':
                    sum += 100;
                    break;
                case 'D':
                    sum += 1000;
                    break;
                case 'E':
                    sum += 10000;
                    break;    
                case 'F':
                    sum += 100000;
                    break;
                case 'G':
                    sum += 100000;
                    break;
                default:
                    sum += 0;
            }     
        }

        System.out.println(sum);
    }
}