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)

n = input()
a=[]
for  i in range(4):
  a.append(int(n[i]))
out=[]
pi=[]
for i in range(2):
  for j in range(2):
    for k in range(2):
      
      if a[0]+(i*2-1)*a[1]+(j*2-1)*a[2]+(k*2-1)*a[3] ==7:

        if i*2-1 ==1:
          pi.append('+')
        else:
          pi.append('-')
        if j*2-1 ==1:
          pi.append('+')
        else:
          pi.append('-')
        if k*2-1 ==1:
          pi.append('+')
        else:
          pi.append('-')
              
        for h in range(3):
          print(a[h],end="")
          print(pi[h],end="")
        print(a[3],end="")
        print('=7')
        exit()  
      else:
        f=0