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.math.BigInteger;
import java.util.Scanner;

public class Main
{
	public static void main(String[] args)
	{
		Scanner in=new Scanner(System.in);
		String s=in.next();
		char a[]=s.toCharArray();
		int b[]=new int[5];
		for(int i=0;i<4;i++)
			b[i]=a[i]-'0';
		boolean flag=true;
		for(int i=0;i<=1 && flag;i++)
			for(int j=0;j<=1 && flag;j++)
				for(int k=0;k<=1 && flag;k++)
				{
					int res=b[0];
					if(i==0)res+=b[1];
					if(i==1)res-=b[1];
					if(j==0)res+=b[2];
					if(j==1)res-=b[2];
					if(k==0)res+=b[3];
					if(k==1)res-=b[3];
					if(res==7)
					{
						System.out.print(b[0]);
						if(i==0)System.out.print("+");
						else System.out.print("-");
						System.out.print(b[1]);
						if(j==0)System.out.print("+");
						else System.out.print("-");
						System.out.print(b[2]);
						if(k==0)System.out.print("+");
						else System.out.print("-");
						System.out.print(b[3]);
						flag=false;
					}
				}
		System.out.print("=7");
		System.out.println();
	}
}