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
input = sys.stdin.readline


def readstr():
    return input().strip()


def readint():
    return int(input())


def readnums():
    return map(int, input().split())


def readstrs():
    return input().split()


def main():
    abcd = list(map(int, list(readstr())))
    l = [['+', '+', '+'], ['+', '+', '-'], ['+', '-', '+'], ['+', '-', '-'], ['-', '+', '+'], ['-', '+', '-'], ['-', '-', '+'], ['-', '-', '-']]
    for ll in l:
        ans = abcd[0]
        for i, x in enumerate(ll):
            if x == '+':
                ans += abcd[i + 1]
            else:
                ans -= abcd[i + 1]
        if ans == 7:
            s = ''
            for i in range(3):
                s += str(abcd[i]) + ll[i]
            s += str(abcd[3])
            print(s + '=7')
            break


if __name__ == "__main__":
    main()