#include <stdio.h>

int gcd(int a, int b)
{
    if (b == 0)
        return a;
    else
        return gcd(b, a % b);
}

int reverse(int a) // 翻转数字
{
    int index = 0;
    int all = 0;
    while (a > 0)
    {
        all = all * 10 + a % 10;
        a /= 10;
    }
    return all;
}

int main()
{

    int a, b;
    scanf("%d %d", &a, &b);

    int m = reverse(a);
    int n = reverse(b);

    printf("%d", gcd(m, n));
}