#include <bits/stdc++.h>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-9;
const ll mod=1e9+7;
const int dx[4]={0,1,0,-1},dy[4]={1,0,-1,0};

ll gcd(ll a,ll b){
	if(!b) return a;
	return gcd(b,a%b);
}

ll A,B;

int main(){
	cin>>A>>B;
	string s=to_string(A),t=string(40,'0'),b=to_string(B);
	reverse(b.begin(),b.end());
	int N=s.size();
	for(int i=N-1;i>=0;i--) for(int j=0;j<s[i]-'0';j++) for(int k=0;k<b.size();k++){
		int T=(b[k]-'0')+(t[N-i-1+k]-'0');
		t[N-i-1+k]=(char)('0'+T%10);
		if(T>9){
			for(int l=N-i+k;;l++){
				if(t[l]=='9') t[l]='0';
				else{
					t[l]++;
					break;
				}
			}
		}
	}
	reverse(t.begin(),t.end());
	ll M=0;
	for(int i=0;i<40;i++) M=(10*M+(t[i]-'0'))%(A+B);
	cout<<gcd(M,A+B)<<endl;
}