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: Wrong Answer)

def main():
    (A,B,C,D) = map(int, input())
    operation = ['+','-']
    for op1 in operation:
        sum = A
        if op1=='+':
            sum+=B
        else:
            sum-=B
        for op2 in operation:
            if op1=='+':
                sum+=C
            else:
                sum-=C
            if 7-sum==D:
                op3 = '+'
                print(str(A)+op1+str(B)+op2+str(C)+op3+str(D)+'=7')
                return
            elif sum-7==D:
                op3 = '-'
                print(str(A)+op1+str(B)+op2+str(C)+op3+str(D)+'=7')
                return

main()