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)

import sys



def plus_or_minus(opr1, opr2, op):
    if op == '+':
        return opr1 + opr2
    else:
        return opr1 - opr2


A, B, C, D = map(int,list(input()))

op = ['+', '-']

for i in range(2):
    for j in range(2):
        for k in range(2):
            o2 = plus_or_minus(A, B, op[i])
            o3 = plus_or_minus(o2, C, op[j])
            o4 = plus_or_minus(o3, D, op[k])
            if o4 == 7:
                print('{}{}{}{}{}{}{}=7'.format(A, op[i], B, op[j], C, op[k], D))
                sys.exit()