#define _CRT_SECURE_NO_WARNINGS
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <vector>
#include <set>
using namespace std;
#define ll long long
#define ri register int
#define rl register long long
#define mst(x,y) memset(x, y, sizeof(x))
#define ciallo putchar('\n')
#define ilv inline void
#define ili inline int
#define ilb inline bool
#define ill inline long long
constexpr auto N = 1000010;
ll gcd(ll a, ll b)
{
    return b ? gcd(b, a % b) : a;
}
string str;
vector<ll> b;
bool check(ll x)
{
    ll temp = 0;
    for (auto i : str)
        temp = (temp * 10 + i - '0') % x;
    return temp;
}
bool vis[20];
int main()
{
    /*freopen("gcd.in", "r", stdin);
    freopen("gcd.out", "w", stdout);*/

    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    cin >> str;
    ll t = 0;
    for (auto i : str)
        vis[i - '0'] = 1;
    for (ri i = 0; i <= 9; ++i)
        for (ri j = 0; j < i; ++j)
            if (vis[i] && vis[j])
            t = gcd(t, 9ll * (i - j));
    if (!t)
    {
        cout << str;
        return 0;
    }
    for (int i = t; i >= 1; --i)
    {
        if (!(t % i) && !check(i))
        {
            cout << i;
            return 0;
        }
    }

    fclose(stdin);
    fclose(stdout);
    return 0;
}