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{

	static int []a;
	static int []b;
	static int ans;
	static int count;
	public static void main(String[] args) {
		boolean b = false;
		a = new int [4];
		Scanner sc =  new Scanner(System.in);		//入s力
		int n = sc.nextInt();				//入力したのをint型に変換
		for(int i = 0;i<4;i++){
			int m = 1;
			for(int j = 3-i;j >0; j--){
				m *= 10;
			}
			a[i] = n/m;
			n -= (n/m)*m;
			
		}			//四つの数字をaに入れる
		int A = a[0];
		int B = a[1];
		int C = a[2];
		int D = a[3];
		
		for(int i = 0;i < 8;i++){
			switch (i) {
			case 0:
				if(A+B +C+D == 7)
					System.out.println(A+"+"+B+"+"+C+"+"+D+"=7");
				break;
			case 1:
				if(A-B+C+D == 7)
					System.out.println(A+"-"+B+"+"+C+"+"+D+"=7");
				break;
			case 2:
				if(A+B-C+D == 7)
					System.out.println(A+"+"+B+"-"+C+"+"+D+"=7");
				break;
			case 3:
				if(A+B+C-D == 7)
					System.out.println(A+"+"+B+"+"+C+"-"+D+"=7");
				break;
			case 4:
				if(A-B-C+D == 7)
					System.out.println(A+"-"+B+"-"+C+"+"+D+"=7");
				break;
			case 5:
				if(A-B+C-D == 7)
					System.out.println(A+"-"+B+"+"+C+"-"+D+"=7");
				break;
			case 6:
				if(A+B-C-D == 7)
					System.out.println(A+"+"+B+"-"+C+"-"+D+"=7");
				break;
			case 7:
				if(A-B-C-D == 7)
					System.out.println(A+"-"+B+"-"+C+"-"+D+"=7");
				break;
				

			default:
				break;
			}
		}
		

	}



}