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)

ABCD = list(input())
A = int(ABCD[0])
B = int(ABCD[1])
C = int(ABCD[2])
D = int(ABCD[3])

flag = True
for i in ['+', '-']:
    if flag:
        sumAB = A + B if i == '+' else A - B
        for j in ['+', '-']:
            if flag:
                sumABC = sumAB + C if j == '+' else sumAB - C
                for k in ['+', '-']:
                    if flag:
                        sumABCD = sumABC + D if k == '+' else sumABC - D
                        if sumABCD == 7:
                            print(str(A) + i + str(B) + j + str(C) + k + str(D) + "=7")
                            flag = False