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: Runtime Error)

s=str(input())
n1=s[0]
n2=s[1]
n3=s[2]
n4=s[3]
sum1=0
sum2=0
sum3=0
ans=''
op=['+','-']
for i in range(2):
  if i == 0:
    sum1 = n1+n2
  else:
    sum1 = n1-n2
  for j in range(2):
    if j == 0:
      sum2 = sum1+n3
    else:
      sum2 = sum1-n3
    for k in range(2):
      if k == 0:
        sum3=sum2+n4
      else:
        sum3=sum2-n4
      if sum3==7:
        ans=str(n1)+op[i]+str(n2)+op[j]+str(n3)+op[k]+str(n4)+'=7'
print(ans)