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)

#-*-coding:utf-8-*-

def main():
    a, b, c, d = [int(i) for i in list(input())]
    lists = [b, c, d]

    for i in range(2 ** 3):
        s = a
        ops = list('{:03b}'.format(i))
        for op, j in zip(ops, lists):
            if op == '0':
                s += j
            else:
                s -= j
        if s == 7:
            sen = str(a)
            for j, k in zip(lists, ops):
                if k == '0':
                    op1 = '+'
                else:
                    op1 = '-'
                sen = sen + op1 + str(j)
            print(sen + '=7')
            break

if __name__ == '__main__':
    main()