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.*;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        int[][] op = new int[][]{{1,1,1},{1,1,-1},{1,-1,1},{-1,1,1},{-1,-1,1},{-1,1,-1},{1,-1,-1},{-1,-1,-1}};
        int[] a = new int[4];
        for(int i=0;i<4;i++){
            a[i] = S.charAt(i)-'0';
        }
        String[] dic = new String[]{"-"," ","+"};
        for(int i=0;i<8;i++){
            int[] cur = op[i];
            int res = a[0]+a[1]*cur[0]+a[2]*cur[1]+a[3]*cur[2];
            if(res == 7){
                StringBuilder sb = new StringBuilder();
                sb.append(a[0]);
                sb.append(dic[cur[0]+1]);
                sb.append(a[1]);
                sb.append(dic[cur[1]+1]);
                sb.append(a[2]);
                sb.append(dic[cur[2]+1]);
                sb.append(a[3]);
                sb.append("=7");
                System.out.println(sb.toString());
                System.exit(0);
            }
        }
    }
}