//
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define lch (o << 1)
#define rch (o << 1 | 1)

typedef double db;
typedef long long ll;
typedef unsigned int ui;
typedef pair<int, int> pint;
typedef tuple<int, int, int> tint;

const int N = 100 + 5;
const int INF = 0x3f3f3f3f;
const ll INF_LL = 0x3f3f3f3f3f3f3f3f;
const int dx[] = {-1, 0, 1, 0, 2};
const int dy[] = {0, 1, 0, -1, 0};

int vst[N][N][2];
int f[N][N][2], nxt[N][N][2]; // 0: first, 1: second

bool OK(int x, int y) {
	return x >= 0 && x <= 9 && y >= 0 && y <= 9;
}

void BFS() {
	memset(f, 0x3f, sizeof(f));
	memset(nxt, -1, sizeof(nxt));

	for (int i = 0; i < 100; i++)
		for (int op = 0; op <= 1; op++)
			f[i][i][op] = 0;

	for (int t = 1; t < 100; t++) {
		for (int op = 0; op <= 1; op++)
			for (int u = 0; u < 100; u++)
				for (int v = 0; v < 100; v++) {
					if (f[u][v][op] != INF) continue;

					int minf = INF, minid = -1;
					int maxf = -INF, maxid = -1;
					for (int d = 0; d < 5; d++) {
						int nx = u / 10 + dx[d];
						int ny = u % 10 + dy[d];
						if (!OK(nx, ny)) continue;
						// special judge 79 -> 99
						if (d == 4 && u != 79) continue;

						int nu = nx * 10 + ny;
						int tmpf = f[v][nu][op ^ 1];
						if (tmpf < minf) minf = tmpf, minid = nu;
						if (tmpf > maxf) maxf = tmpf, maxid = nu;
					}

					if (op == 0 && minf != INF) {
						f[u][v][op] = minf + 1;
						nxt[u][v][op] = minid;
					}
					if (op == 1 && maxf != -INF && maxf != INF) {
						f[u][v][op] = maxf + 1;
						nxt[u][v][op] = maxid;
					}
				}
	}
}

int GetPow(int x, int d) {
	int ret = 0;
	while (x % d == 0) {
		ret++;
		x /= d;
	}
	return ret;
}

int main() {
	ios::sync_with_stdio(0);

	BFS();

	int u, v;
	cin >> u >> v;
	int ux = GetPow(u, 2), uy = GetPow(u, 5);
	int vx = GetPow(v, 2), vy = GetPow(v, 5);
	u = ux * 10 + uy;
	v = vx * 10 + vy;

	while (u != v) {
		u = nxt[u][v][0];
		cout << int(pow(2, u / 10) * pow(5, u % 10)) << endl;
		cout << flush;
		if (u == v) break;
		cin >> v;
		vx = GetPow(v, 2), vy = GetPow(v, 5);
		v = vx * 10 + vy;
	}

	return 0;
}