最完美的解决思路，一行代码搞定

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num = scan.nextInt();
        scan.close();

        //write code here......
        // 最完美的思路，一行代码搞定
        System.out.println((num + "").length());
    }
}