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)

ABCD = str(input())
n = [int(i) for i in ABCD]
#ABCD = '0290'
#n = [0,2,9,0]

ans = ''

for i in range(2**3):

  x = format(i,'b').zfill(3)
  c = n[0]

  for j in range(1,4):
    if x[j-1] == '0':
      c += n[j]
    else :
      c -= n[j]
 
  if c == 7:
    ans = x
    break

ans = ans.replace('0','+')
ans = ans.replace('1','-')

out = ABCD[0]+ans[0]+ABCD[1]+ans[1]+ABCD[2]+ans[2]+ABCD[3]+'=7'
print(out)