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.io.*;
import java.util.ArrayList;
import java.util.Collections;

class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str = br.readLine();
        int A = Integer.parseInt(String.valueOf(str.charAt(0)));
        int B = Integer.parseInt(String.valueOf(str.charAt(1)));
        int C = Integer.parseInt(String.valueOf(str.charAt(2)));
        int D = Integer.parseInt(String.valueOf(str.charAt(3)));
        if (A+B+C+D==7){
            System.out.println(String.format("%d+%d+%d+%d=7", A,B,C,D));
        } else if (A-B+C+D==7){
            System.out.println(String.format("%d-%d+%d+%d=7", A,B,C,D));
        } else if (A+B-C+D==7){
            System.out.println(String.format("%d+%d-%d+%d=7", A,B,C,D));
        } else if (A+B+C-D==7){
            System.out.println(String.format("%d+%d+%d-%d=7", A,B,C,D));
        } else if (A-B-C+D==7){
            System.out.println(String.format("%d-%d-%d+%d=7", A,B,C,D));
        } else if (A-B+C-D==7){
            System.out.println(String.format("%d-%d+%d-%d=7", A,B,C,D));
        } else if (A+B-C-D==7){
            System.out.println(String.format("%d+%d-%d-%d=7", A,B,C,D));
        } else {
            System.out.println(String.format("%d-%d-%d-%d=7", A,B,C,D));
        }
    }
}