也是没谁了~
#include <iostream>
using namespace std;

bool state[101] = {false};

int mx(int a, int b){
	if(a > b) return a;
	return b;
}

void init(){
	for(int i = 0; i <= 100; i++) state[i] = false;
}

bool can(int a, int b, int mxa, int mxb){
	if(a == 1 && b == 1) return true;
	if(a > 1 && mxa <= 1) return false;
	if(b > 1 && mxb <= 1) return false;
	int mxx = mx(mxa, mxb);
	for(int i = mxx; i >= 2; i--){
		if(i <= mxa && state[i] == false && a%i == 0){
			state[i] = true;
			if(can(a/i, b, i-1, mxb)) return true;
			state[i] = false;
		}
		if(i <= mxb && state[i] == false && b%i == 0){
			state[i] = true;
			if(can(a, b/i, mxa, i-1)) return true;
			state[i] = false;
		}
	}
	return false;
}

int main() {
	int a, b;
	while(cin >> a >> b){
		init();
		if(a == 0 && b == 0) return 0;
		if(a > b){
			int temp = a;
			a = b;
			b = temp;
		}
		//cout << can(a, b, 100, 100) << endl;
		//cout << can(a, 1, 100, 1) << endl;
		if(can(a, b, 100, 100)) cout << b << endl;
		else if(can(a, 1, 100, 1)) cout << a << endl;
		else cout << b << endl;
	}
	return 0;
}