package no443;

import java.math.BigInteger;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		long stime = System.nanoTime();
		Scanner sc = new Scanner(System.in);
		char[] s = sc.next().toCharArray();
		int n = s.length;
		BigInteger gcd = new BigInteger(String.valueOf(s));
		while((System.nanoTime() - stime) / 1000000 <= 900) {
			for(int i=0;i<n-1;i++) {
				int j = randInt(i,n-1);
				char temp = s[i];
				s[i] = s[j];
				s[j] = temp;
			}
			gcd = gcd.gcd(new BigInteger(String.valueOf(s)));
		}
		System.out.println(gcd);
	}

	public static int randInt(int min,int max) {
		return (int) (Math.random() * (max - min + 1)) + min;
	}

}