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)

def main():
    ABCD = input()
    A = int(ABCD[0])
    B = int(ABCD[1])
    C = int(ABCD[2])
    D = int(ABCD[3])
    for i in range(2):
        for j in range(2):
            for k in range(2):
                ans = 0
                op1 = ""
                op2 = ""
                op3 = ""
                if i % 2 == 0:
                    ans = A + B
                    op1 = "+"
                else:
                    ans = A - B
                    op1 = "-"
                
                if j % 2 == 0:
                    ans = ans + C
                    op2 = "+"
                else:
                    ans = ans - C
                    op2 = "-"
                
                if k % 2 == 0:
                    ans = ans + D
                    op3 = "+"
                else:
                    ans = ans - D
                    op3 = "-"

                if ans == 7:
                    print("{}{}{}{}{}{}{}=7".format(A, op1, B, op2, C, op3, D))
                    exit()
if __name__ == "__main__":
    main()