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)

s = str(input())
opl = []
op = [''] * 3
for i in range(2):
  if i % 2 == 0:
    op[0] = '+'
  else:
    op[0] = '-'
  for j in range(2):
    if j % 2 == 0:
      op[1] = '+'
    else:
      op[1] = '-'
    for k in range(2):
      if k % 2 == 0:
        op[2] = '+'
      else:
        op[2] = '-'
      opn = op[:]
      opl.append(opn)    
for i in range(2 * 3):
  if eval(s[0]+opl[i][0]+s[1]+opl[i][1]+s[2]+opl[i][2]+s[3]) == 7:
    ss = s[0]+opl[i][0]+s[1]+opl[i][1]+s[2]+opl[i][2]+s[3]
    print(ss,"=7")
    break