Lv166 turned over

【2020HBU Ladder training 】7-18 6 flared up _ Han Xu 051 The blog of -CSDN Blog

```cpp
#include<iostream>
using namespace std;
int main() {
	string s;
	getline(cin,s);  
	int i=0;
	int cnt;
	while(i<s.size()){
		if(s[i]!='6') cout<<s[i++];
		else{
			for(cnt=0;s[i]=='6'&&i<s.size();i++,cnt++);
			if(cnt>9) cout<<27;
			else if(cnt>3) cout<<9;
			else 
				while(cnt--) cout<<6;
		}	
		}
	return 0;
}