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 PyPy3 (2.4.0) (judge verdict: Accepted)

n = input()
a,b,c,d = n[0], n[1], n[2], n[3] 

def calc(arg1, arg2, arg3):
    if arg1 == 0:
        arg2 += "+" + arg3
    else:
        arg2 += "-" + arg3
    return arg2


for op1 in range(2):
    for op2 in range(2):
        for op3 in range(2):
            ans = a
            ans = calc(op1, ans, b)
            ans = calc(op2, ans, c)
            ans = calc(op3, ans, d)
            if eval(ans) == 7:
               break
        else:
            continue
        break
    else:
        continue
    break

print(ans + "=7")