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)

#数字同士のすき間の個数分、二択（+ or −）が存在し、それらを全探索したい
n = input()
op_cnt = len(n) - 1 #隙間の個数
for i in range(2**op_cnt):
    op = ["-"]*op_cnt #あらかじめ["-","-","-"] というリストを作っておく
    for j in range(op_cnt):
        if((i>>j)&1):
            op[op_cnt -1 -j] = "+" 
    #print(op)
    formula = ""
    for p_n,p_o in zip(n, op+[""]):
        formula += (p_n + p_o)
    if eval(formula) == 7:
        print(formula + "=7")
        break