#include <bits/stdc++.h>
using namespace std;
 
#define fi first
#define se second
#define pb push_back
using vi = vector <int>;
using ll = long long;
using vl = vector <ll>;
using pii = pair <int, int>;
const ll mod = 998244353;
//~ const ll mod = 1e9 + 7;
ll qpow(ll a, ll b, ll m = mod) { ll r = 1, t = a;
	for(; b; b /= 2) { if(b & 1) r = r * t % m; t = t * t % m; } return r; }

int cnt[10];

bool check(string s, int d) {
	int x = 0;
	for(char c : s) {
		x = x * 10 + (c - '0');
		x %= d;
	}
	return x == 0;
}

int main() {
	ios::sync_with_stdio(0);
	string s; cin >> s;
	for(char c : s)
		cnt[c - '0'] ++;
	
	int g = 0;
	for(int i = 0; i < 10; i ++)
		for(int j = 0; j < i; j ++) if(cnt[i] && cnt[j]) {
			int x = (10 * i + j) - (10 * j + i);
			g = gcd(g, x);
		}
	
	if(g == 0)
		cout << s << '\n';
	else {
		for(int i = g; i >= 1; i --)
			if(g % i == 0 && check(s, i)) {
				cout << i << '\n';
				break;
			}
	}
}