#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
using namespace std;
typedef long long int ll;
typedef pair<int, int> P;

int gcd(int a, int b){
	if(b==0) return a;
	return gcd(b, a%b);
}

int main()
{
	string n;
	cin>>n;
	int d=n.size();
	if(d==1){
		cout<<n<<endl;
		return 0;
	}
	int g=-1;
	for(int i=d-1; i>=1; i--){
		if(n[i]!=n[i-1]){
			if(g==-1){
				g=abs((int)(n[i]-n[i-1]));
			}else{
				g=gcd(g, abs((int)(n[i]-n[i-1])));
			}
		}
	}
	if(g==-1){
		cout<<n<<endl;
		return 0;
	}
  g*=9;
	for(int k=g; k>=2; k--){
		if(g%k!=0) continue;
		int r=0, p10=1;
		for(int i=d-1; i>=0; i--){
			r+=((n[i]-'0')*p10%k);
			r%=k;
			p10*=10;
			p10%=k;
		}
		if(r==0){
			cout<<k<<endl;
			return 0;
		}
	}
	cout<<1<<endl;
	return 0;
}