#include <bits/stdc++.h>

using namespace std;
#define IOS ios::sync_with_stdio(false), cin.tie(0);
typedef long long LL;

//const int N=;

int main()
{
    IOS
    string s;
    cin>>s;
    int ans=0;
    for(auto it: s){
        if(it=='0'||it=='6'||it=='9') ans++;
        else if(it=='8') ans+=2;
    }
    cout<<ans;
    return 0;
}

if判断是否为那几个字符即可，注意8是+=2， 最后输出答案

#牛客春招刷题训练营#