#include <bits/stdc++.h>
using namespace std;

string s;

map<int,int> S;
int main(){
	cin >> s;
	for (int i = 0; i < s.size(); i++){
		S[s[i] - '0']++;
	}
	if (S.size() == 1){
		cout << s << endl;
		return 0;
	}
	int gc = 0;
	for (auto it = S.begin(); it != S.end(); it++){
		S[(*it).first]--;
		for (auto itt = S.begin(); itt != S.end(); itt++){
			if ((*itt).second){
				int a = 10 * (*it).first;
				a += (*itt).first;
				int b = 10 * (*itt).first;
				b += (*it).first;
				int sa = abs(a-b);
				if(sa)gc = __gcd(gc, sa);
			}
		}
		S[(*it).first]++;
	}
	cout << gc << endl;
	return 0;
}