Petya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal record contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.

Petya loves long lucky numbers very much. He is interested in the minimum lucky number d that meets some condition. Let cnt(x) be the number of occurrences of number x in number d as a substring. For example, if d = 747747, then cnt(4) = 2, cnt(7) = 4, cnt(47) = 2, cnt(74) = 2. Petya wants the following condition to fulfil simultaneously: cnt(4) = a1, cnt(7) = a2, cnt(47) = a3, cnt(74) = a4. Petya is not interested in the occurrences of other numbers. Help him cope with this task.

Input

The single line contains four integers a1, a2, a3 and a4 (1 ≤ a1, a2, a3, a4 ≤ 106).

Output

On the single line print without leading zeroes the answer to the problem — the minimum lucky number d such, that cnt(4) = a1, cnt(7) = a2, cnt(47) = a3, cnt(74) = a4. If such number does not exist, print the single number "-1" (without the quotes).

Examples

Input

2 2 1 1


Output

4774


Input

4 7 3 1


Output

-1
import java.util.Scanner;

/*LUCKY NO2 */
public class Round104D {

    static int[] c;

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        c = new int[4];
        c[0] = in.nextInt();
        c[1] = in.nextInt();
        c[2] = in.nextInt();
        c[3] = in.nextInt();
        if (Math.abs(c[2] - c[3]) > 1) {
            System.out.println(-1);
            return;
        }
        int min4s, min7s;
        StringBuffer result = new StringBuffer("");
        if (c[2] == c[3]) {
                    for (int i = 0; i < c[2]; i++)
                    result = result.append("47");
                result = result.append("4");
                min4s = c[2] + 1;
                min7s = min4s - 1;
                if (c[0] < min4s && c[1] >= min7s) {
                    result = new StringBuffer("");
                    for (int i = 0; i < c[2]; i++)
                        result = result.append("74");
                    result = result.append("7");
                    min7s = c[2] + 1;
                    min4s = min4s - 1;

            }

        } else if (c[2] > c[3]) {
            for (int i = 0; i < c[2]; i++)
                result = result.append("47");
            min4s = min7s = c[2];
        } else {
            for (int i = 0; i < c[3]; i++)
                result = result.append("74");
            min4s = min7s = c[3];
        }
        if (c[0] < min4s || c[1] < min7s) {
            System.out.println("-1");
            return;
        }

        int delta4s = c[0] - min4s;
        StringBuffer fours = new StringBuffer("");
        for (int i = 0; i < delta4s; i++)
            fours = fours.append("4");

        int delta7s = c[1] - min7s;
        StringBuffer sevens = new StringBuffer("");
        for (int i = 0; i < delta7s; i++)
            sevens = sevens.append("7");

        int len = result.length();
        int index4 = 0;
        for (int i = 0; i < len; i++) {
            if (result.charAt(i) == '4') {
                index4 = i;
                break;
            }
        }
        result = result.replace(index4, index4 + 1, fours + "4");

        int index7 = 0;
        len = result.length();
        for (int i = len - 1; i > -1; i--) {
            if (result.charAt(i) == '7') {
                index7 = i;
                break;
            }
        }

        result = result.replace(index7, index7 + 1, sevens + "7");

        System.out.println(result);
    }

}
