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.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        char[] s = sc.next().toCharArray();
        int[] li = new int[s.length];
        for(int i = 0; i < s.length; i++){
            li[i] = Character.getNumericValue(s[i]);
        }
        for(int i = 0; i < 2; i++){
            int tmp1 = i == 0 ? li[0] + li[1] : li[0] - li[1];
            for(int j = 0; j < 2; j++){
                int tmp2 = j == 0 ? tmp1 + li[2] : tmp1 - li[2];
                for(int k = 0; k < 2; k++){
                    int chk = k == 0 ? tmp2 + li[3] : tmp2 - li[3];
                    if(chk == 7){
                        String op1 = i == 0 ? "+" : "-";
                        String op2 = j == 0 ? "+" : "-";
                        String op3 = k == 0 ? "+" : "-";
                        System.out.println(li[0] + op1 + li[1] + op2 + li[2] + op3 + li[3] +  "=7");
                        return;
                    }
                }
            }
        }
    }
}