import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int number = in.nextInt(); String s = Integer.toString(number); while(s.length()!=1){ int total = 0; for(int i=0; i<s.length(); i++){ t...