#include<bits/stdc++.h>
#define int long long
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
using namespace std;
template<typename T>istream&operator>>(istream&I,vector<T>&v){for(auto&i:v)I>>i;return I;}
template<typename T>ostream&operator<<(ostream&O,vector<T>&v){for(auto&i:v)O<<i<<' ';return O;}
namespace AC{
void solve(){
	string s;
	cin>>s;
	int n=s.size();
	vector<bool>vis(10);
	for(auto i:s)vis[i-'0']=1;
	int d=0;
	for(int i=0;i<10;i++)for(int j=i+1;j<10;j++)if(vis[i]&&vis[j])d=__gcd(d,9*(j-i));
	if(!d){
		cout<<s<<endl;
		return;
	}
	vector<bool>ans(100);
	for(int i=1;i<100;i++)if(d%i==0)ans[i]=1;
	for(int i=0;i<1;i++){
		random_shuffle(all(s));
		for(int j=1;j<100;j++)if(ans[j]){
			int tmp=0;
			for(int k=0;k<n;k++)tmp=(tmp*10+s[k]-'0')%j;
			if(tmp^0)ans[j]=0;
		}
	}
	for(int i=99;i>=0;i--)if(ans[i]){
		cout<<i<<endl;
		return;
	}
}
}
signed main(){
	int t=1;
	//cin>>t;
	while(t--)AC::solve();
}