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(str(input()))
for k in range(4):
    abcd[k] = int(abcd[k])
#print(abcd)

for i in range(1 << 3):
    info = [abcd[0]]
    for j in range(3):
        if (i >> j) & 1:
            info.append(-1*(abcd[j + 1]))
        else:
            info.append((abcd[j + 1]))
    if sum(info) == 7:
        p = str(abcd[0])
        for m in range(1, 4):
            if info[m] >= 0:
                p += ("+"+str(info[m]))
            else:
                p += (str(info[m]))
        print(p+"=7")
        exit()