#include <bits/stdc++.h>
using namespace std;
#define bokusunny ios::sync_with_stdio(false), cin.tie(nullptr);

void solve() {
  int P, x;
  long long Q, y;
  cin >> P >> Q >> x >> y;

  long long revN = y;
  while (revN % 10 == 0) revN += Q;
  string NS = to_string(y);
  reverse(NS.begin(), NS.end());
  long long N = stoll(NS);
  N %= P;
  string ans = NS;

  for (int i = 0; i <= P; i++) {
    if (N == x) {
      cout << ans << endl;
      return;
    }

    N *= 10;
    N %= P;
    ans += '0';
  }
  assert(false);
}

int main() {
  bokusunny;
  solve();

  return 0;
}