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)

input_tuple = tuple(map(int,list(input())))

n = 3
c_list = [list(map(int,format(i,"b").zfill(n))) for i in range(2**n)]

for i in c_list:
    input_list = list(input_tuple)
    for j, v in enumerate(i):
        if v == 1:
            input_list[j+1] = input_list[j+1] * -1
    if sum(input_list) == 7:
        break
ans = [str(input_list[0])]
for j in range(3):
    if i[j] == 0:
        ans.append("+")
    ans.append(str(input_list[j+1]))
else:
    ans.append("=7")

print("".join(ans))