import java.io.PrintStream;
import java.util.Scanner;


public class Y443 {
	Scanner in = new Scanner(System.in);
	PrintStream out = new PrintStream(System.out);

	Y443() throws Exception {
		String s = in.next();
		
		boolean[] flag = new boolean[10];
		
		if (isRepetitive(s)) {
			out.println(s);
			return;
		}
		
		for (int i = 0; i < s.length(); i++) {
			flag[s.charAt(i) - '0'] = true;
		}
		
		long g = 0;
		
		for (int i = 0; i < 10; i++) {
			for (int j = i + 1; j < 10; j++) {
				if (flag[i] && flag[j]) {
					g = gcd(g, 9 * (j - i));
				}
			}
		}
		
	
		for (int i = (int)g; i>0; i--) {
			if (g % i == 0 && divisible(s, i)) {
				out.println(i);
				return;
			}
		}
	}
	
	boolean isRepetitive(String s) {
		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(0) != s.charAt(i)) {
				return false;
			}
		}
		return true;
	}

	boolean divisible(String s, int x) {
		int r = 0;
		for (int i = 0; i < s.length(); i++) {
			r = (r * 10 + s.charAt(i) - '0') % x;
		}
		return r == 0;
	}
	
	long gcd(long x, long y) {
		while (y > 0) {
			x %= y;
			long t = x; x = y; y = t;
		}
		return x;
	}

	public static void main(String argv[]) throws Exception {
		new Y443();
	}
}