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;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int a = x/1000;
		int b = x/100 -a*10;
		int c = x/10 -a*100 - b*10;
		int d = x-a*1000-b*100-c*10;

		if(a+b+c+d==7)
			System.out.print(a+"+"+b+"+"+c+"+"+d+"=7");
		else {
			if(a+b+c-d==7)
				System.out.print(a+"+"+b+"+"+c+"-"+d+"=7");
			else {
				if(a+b-c+d==7)
					System.out.print(a+"+"+b+"-"+c+"+"+d+"=7");
				else {
					if(a-b+c+d==7)
						System.out.print(a+"-"+b+"+"+c+"+"+d+"=7");
					else {
						if(a+b-c-d==7)
							System.out.print(a+"+"+b+"-"+c+"-"+d+"=7");
						else {
							if(a-b+c-d==7)
								System.out.print(a+"-"+b+"+"+c+"-"+d+"=7");
							else {
								if(a-b-c+d==7)
									System.out.print(a+"-"+b+"-"+c+"+"+d+"=7");
								else
									System.out.print(a+"-"+b+"-"+c+"-"+d+"=7");
							}
						}
					}
				}
			}
		}
	}

}