import std.algorithm, std.conv, std.range, std.stdio, std.string;
import std.numeric;   // gcd, fft

void main()
{
  auto n = readln.chomp.to!int, m = n;

  int[] a;
  while (m > 1) {
    a ~= m % 10;
    m /= 10;
  }

  a = a.sort().uniq.array;
  auto na = a.length;

  if (na == 1) {
    writeln(n);
    return;
  }

  auto ans = n;
  foreach (i; 0..na-1)
    foreach (j; i+1..na)
      ans = gcd(ans, 9*(a[j]-a[i]));

  writeln(ans);
}