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 Python (3.4.3) (judge verdict: Accepted)

# -*- coding: utf-8 -*-
import sys

def main():
	tmp = input()
	tmp2 = list(tmp)
	num = [int(s) for s in tmp2]
	
	op1 = ""
	op2 = ""
	op3 = ""
	if num[0] + num[1] + num[2] + num[3] == 7:
		op1 = "+"
		op2 = "+"
		op3 = "+"
	if num[0] + num[1] + num[2] - num[3] == 7:
		op1 = "+"
		op2 = "+"
		op3 = "-"
	if num[0] + num[1] - num[2] - num[3] == 7:
		op1 = "+"
		op2 = "-"
		op3 = "-"
	if num[0] - num[1] + num[2] - num[3] == 7:
		op1 = "-"
		op2 = "+"
		op3 = "-"
	if num[0] - num[1] - num[2] + num[3] == 7:
		op1 = "-"
		op2 = "-"
		op3 = "+"
	if num[0] - num[1] - num[2] - num[3] == 7:
		op1 = "-"
		op2 = "-"
		op3 = "-"
	if num[0] + num[1] - num[2] + num[3] == 7:
		op1 = "+"
		op2 = "-"
		op3 = "+"
	if num[0] - num[1] + num[2] + num[3] == 7:
		op1 = "-"
		op2 = "+"
		op3 = "+"
	print("{}{}{}{}{}{}{}=7".format(num[0], op1, num[1], op2, num[2], op3, num[3]))
		
if __name__ == "__main__":
	main()