#include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;

bool isDiv(string s, int d){
  int cur = 0;
  rep(i,s.size()){
    cur = cur * 10 + (int)(s[i]-'0');
    while( cur >= d ) cur -= d;
  }
  return cur == 0;
}

int main(){
  string s;
  cin >> s;
  int l = s.size();

  vector<int> occ_d;
  rep(i,l) occ_d.emplace_back( s[i]-'0' );
  sort(occ_d.begin(), occ_d.end());
  occ_d.erase( unique(occ_d.begin(), occ_d.end()), occ_d.end() );

  if(occ_d.size() == 1){
    cout << s << endl;
    return 0;
  }

  int gcd = 0;
  for(int a : occ_d){
    for(int b : occ_d){
      int dif = abs(9*a - 9*b);
      gcd = __gcd(gcd, dif);
    }
  }

  int ans = 1;
  for(int i=gcd;i>=1;i--){
    if(gcd%i == 0 and isDiv(s, i)){
      ans = i; break;
    }
  }

  cout << ans << endl;
}