https://pintia.cn/problem-sets/994805046380707840/problems/1111914599408664577

题解：暴力

/*
*@Author:   STZG
*@Language: C++
*/
#include <bits/stdc++.h>
#include<iostream>
#include<algorithm>
#include<cstdlib>
#include<cstring>
#include<cstdio>
#include<string>
#include<vector>
#include<bitset>
#include<queue>
#include<deque>
#include<stack>
#include<cmath>
#include<list>
#include<map>
#include<set>
//#define DEBUG
#define RI register int
#define endl "\n"
using namespace std;
typedef long long ll;
//typedef __int128 lll;
const int N=100000+10;
const int M=100000+10;
const int MOD=1e9+7;
const double PI = acos(-1.0);
const double EXP = 1E-8;
const int INF = 0x3f3f3f3f;
int t,n,m,k,p,l,r,u,v;
int ans,cnt,flag,temp,sum;
int a[N];
char str[N];
struct node{};
int main()
{
#ifdef DEBUG
	freopen("input.in", "r", stdin);
	//freopen("output.out", "w", stdout);
#endif
    //ios::sync_with_stdio(false);
    //cin.tie(0);
    //cout.tie(0);
    //scanf("%d",&t);
    //while(t--){
    cin.getline(str,100000,'\n');
    int len=strlen(str);
    for(int i=0;i<len;i++){
        if(str[i]=='6'){
            int cnt=0;
            for(;i<len;i++){
                if(str[i]=='6')
                    cnt++;
                else
                    break;
            }
            if(cnt>9){
                cout<<27;
            }else if(cnt>3){
                cout<<9;
            }else{
                while(cnt--)
                    cout<<6;
            }
            i--;
        }else{
            cout<<str[i];
        }
    }
    cout<<endl;
    //}

#ifdef DEBUG
	printf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC);
#endif
    //cout << "Hello world!" << endl;
    return 0;
}