import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int p = sc.nextInt();
        int q = sc.nextInt();
        int x = sc.nextInt();
        int y = sc.nextInt();
        int r = y;
        while (r % 10 == 0 || rev(r) % p == 0) {
            r += q;
        }
        StringBuilder sb = new StringBuilder();
        int n = rev(r);
        sb.append(n);
        int mod = n % p;
        while (mod != x) {
            mod *= 10;
            sb.append("0");
            mod = (mod * 10) % p;
        }
        System.out.println(sb);
    }
    
    static int rev(int x) {
        return Integer.parseInt(new StringBuilder(String.valueOf(x)).reverse().toString());
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}