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 Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.Scanner;

public class Main {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    for (int i = 0; i < (1 << S.length() - 1); i++) {
      int total = 0;
      StringBuilder A = new StringBuilder();
      A.append(S.charAt(0));
      for (int j = 0; j < S.length() - 1; j++) {
        if ((1 & (i >> j)) == 1) {
          int X = Character.getNumericValue(S.charAt(j + 1));
          total += X;
          A.append("+");
        } else {
          int X = Character.getNumericValue(S.charAt(j + 1));
          total -= X;
          A.append("-");
        }
        A.append(S.charAt(j + 1));
      }
      // System.out.println(A);
      int Y = Character.getNumericValue(S.charAt(0));
      System.out.println(total + Y);
      if (total + Y == 7) {
        System.out.println(A + "=7");
        break;
      }
    }
  }
}