from math import gcd

n = input()
if len(set(n)) == 1:
    print(n)
    exit()
    
D = [0] * 10
for i in n:
    D[int(i)] = 1
    
g = -1
for i in range(10):
    for j in range(i + 1, 10):
        if D[i] and D[j]:
            if g == -1:
                g = 9 * (j - i)
            else:
                g = gcd(g, 9 * (j - i))
            
print(gcd(int(n), g))