#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
const int N=1e4+10; char s[N]; bool book[20];
int main() {
	//freopen("gcd.in","r",stdin);
	//freopen("gcd.out","w",stdout);
	ios::sync_with_stdio(false),cin.tie(nullptr);
	int n,k=0; cin>>(s+1),n=strlen(s+1);
	for(int i=1;i<=n;i++) book[s[i]-'0']=true;
	for(int i=1;i<9;i++) for(int j=0;j<i;j++) if(book[i]&&book[j]) k=__gcd(k,9*(i-j));
	if(!k) return cout<<(s+1),0;
	for(int i=k;i>=1;i--) {
		if(k%i) continue;
		int r=0;
		for(int j=1;j<=n;j++) r=(r*10+s[j]-'0')%i;
		if(!r) return cout<<i,0;
	}
	return 0;
}