#!/usr/bin/env pypy3

import fractions
import functools
import itertools


def generate_all_swaps(n):
    xs = list(str(n))
    m = len(xs)
    yield n
    for i, j in itertools.combinations(range(m), 2):
        xs[i], xs[j] = xs[j], xs[i]
        yield int("".join(xs))
        xs[i], xs[j] = xs[j], xs[i]


def compute(n):
    return functools.reduce(fractions.gcd, generate_all_swaps(n), n)


def main():
    print(compute(int(input())))


if __name__ == '__main__':
    main()