Problem:
Score : 300 points

Problem Statement

Sitting in a station waiting room, Joisino is gazing at her train ticket.

The ticket is numbered with four digits A, B, C and D in this order, each between 0 and 9 (inclusive).

In the formula A op1 B op2 C op3 D = 7, replace each of the symbols op1, op2 and op3 with + or - so that the formula holds.

The given input guarantees that there is a solution. If there are multiple solutions, any of them will be accepted.

Constraints

0≤A,B,C,D≤9

All input values are integers.

It is guaranteed that there is a solution.

Input

Input is given from Standard Input in the following format:

ABCD

Output

Print the formula you made, including the part =7.

Use the signs + and -.

Do not print a space between a digit and a sign.

Sample Input 1

1222

Sample Output 1

1+2+2+2=7

This is the only valid solution.

Sample Input 2

0290

Sample Output 2

0-2+9+0=7

0 - 2 + 9 - 0 = 7 is also a valid solution.

Sample Input 3

3242

Sample Output 3

3+2+4-2=7

Solution in Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.Scanner;

public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int a = Character.getNumericValue(s.charAt(0));
    int b = Character.getNumericValue(s.charAt(1));
    int c = Character.getNumericValue(s.charAt(2));
    int d = Character.getNumericValue(s.charAt(3));
    char[] op = { '+', '-' };
    for (int i = 0; i < 2; i++) {
      for (int j = 0; j < 2; j++) {
        for (int k = 0; k < 2; k++) {
          int tmp = a;
          if (i == 0) {
            tmp += b;
          } else {
            tmp -= b;
          }
          if (j == 0) {
            tmp += c;
          } else {
            tmp -= c;
          }
          if (k == 0) {
            tmp += d;
          } else {
            tmp -= d;
          }
          if (tmp == 7) {
            System.out.println(a + "" + op[i] + "" + b + "" + op[j] + "" + c + "" + op[k] + "" + d + '=' + 7);
            return;
          }
        }
      }
    }

  }
}