firstuppercaseletter

package firstuppercase;

public class App {
    public static void main(String[] args) {
        var result = first("appmSiller");
        System.out.println(result);
    }

   public static char first(String str) {
       if ((str==null)||(str.length() <= 1))
           return 0;

        if(Character.isUpperCase(str.charAt(0))){
           return str.charAt(0);
        }
        return first(str.substring(1));
    }
}