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)

inp = list(input())
a = inp[0]
b = inp[1]
c = inp[2]
d = inp[3]
for i in range(8):
    temp = format(i, '03b')
    templist = list(temp)
    if templist[0] == "0":
        op1 = "+"
    else:
        op1 = "-"
    if templist[1] == "0":
        op2 = "+"
    else:
        op2 = "-"
    if templist[2] == "0":
        op3 = "+"
    else:
        op3 = "-"
    ans = eval(a+op1+b+op2+c+op3+d)
    if ans == 7:
        print(a+op1+b+op2+c+op3+d+"=7")
        exit()