#include <cstdio>
#include <cmath>

#define incID(i, l, r) for(int i = (l)    ; i <  (r); i++)
#define incII(i, l, r) for(int i = (l)    ; i <= (r); i++)
#define decID(i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define decII(i, l, r) for(int i = (r)    ; i >= (l); i--)
#define inc( i, n) incID(i, 0, n)
#define inc1(i, n) incII(i, 1, n)
#define dec( i, n) decID(i, 0, n)
#define dec1(i, n) decII(i, 1, n)

typedef long long   signed int LL;
typedef long long unsigned int LU;

template<typename T> void swap(T &x, T &y) { T t = x; x = y; y = t; return; }
template<typename T> T abs(T x) { return (0 <= x ? x : -x); }
template<typename T> T max(T a, T b) { return (b <= a ? a : b); }
template<typename T> T min(T a, T b) { return (a <= b ? a : b); }
template<typename T> bool setmin(T &a, T b) { if(a <= b) { return false; } else { a = b; return true; } }
template<typename T> bool setmax(T &a, T b) { if(b <= a) { return false; } else { a = b; return true; } }
template<typename T> T gcd(T a, T b) { return (b == 0 ? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }

// ---- ----

const LU X = 1000000000;
int main() {
	LU a, b;
	scanf("%llu%llu", &a, &b);
	LU c = a + b;
	LU au = a / X, al = a % X;
	LU bu = b / X, bl = b % X;
	
	LU p = 0;
	(p += al * bl) %= c;
	LU p2 = 0, p3 = 0;
	(p2 += au * bl) %= c;
	(p3 += al * bu) %= c;
	inc(i, 9) {
		(p2 *= 10) %= c;
		(p3 *= 10) %= c;
	}
	(p2 += p3) %= c;
	(p  += p2) %= c;
	
	LU p4 = 0;
	(p4 += au * bu) %= c;
	inc(i, 18) {
		(p4 *= 10) %= c;
	}
	(p += p4) %= c;
	
	printf("%llu\n", gcd(c, p));
	return 0;
}