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

int main() {
	long long p, q, x, y;
	cin >> p >> q >> x >> y;
	vector<int> table(p + 1, 0);
	int now = 1;
	for(int i = 1; i < p; i++) {
		now *= 10;
		now %= p;
		table[now] = i;
	}

	long long m = y;
	auto chk = [&]() {
		if(m % 10 == 0) return false;
		auto s = to_string(m);
		reverse(s.begin(), s.end());
		long long val = stoll(s);
		return val % p != 0;
	};
	while(!chk()) m += q;

	string res = to_string(m);
	reverse(res.begin(), res.end());
	m = stoll(res);

	int k = table[m % p];
	int l = table[x];
	if(l < k) l += p - 1;

	for(int i = 0; i < l - k; i++) res.push_back('0');
	cout << res << endl;
}