题解 | while

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);
        String n = in.next();
        String s = "while";
        int count = 0;

        for (int i = 0; i < n.length(); i++) {
            char c = n.charAt(i);
            if(c!=s.charAt(i)){
                count++;
            }
        }
        System.out.println(count);
    }
}