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: Accepted)

import java.util.Scanner;

class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    char[] s = sc.next().toCharArray();
    char[] signs = new char[3];
    int sum = 0;
    int sign = 1;
    for(int i=0;i<8;i++){
      sum = 0;
      sign = 1;
      for(int j=0;j<3;j++){
        if(((i>>(2-j)) & 1)==1){
          sum+=(s[j] -'0')*sign;
          sign = 1;
          signs[j] = '+';
        }else{
          sum+=(s[j]-'0')*sign;
          sign = -1;
          signs[j] = '-';
        }
      }
      sum+=(s[3]-'0')*sign;
      if(sum == 7){
        for(int k=0;k<3;k++){
          System.out.print(s[k]+""+signs[k]);
        }
        System.out.print(s[3]+"=7");
        System.out.flush();
       	break;
      }
    }
  }
}