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)

N=list(input())
l=len(N)-1
for n in range(2**l):
    lis=list(format(n,'b'))
    list(map(int,lis))
    nagasa=len(lis)
    if nagasa<l:
        for _ in range(l-nagasa):
            lis.insert(0,0)
    S=int(N[0])
    ans=[]
    for ll in range(l):
        if lis[ll]=='1':
            S=S+int(N[ll+1])
            ans.append('+')
        else:
            S=int(N[ll])-int(N[ll+1])
            ans.append('-')
    if S==7:
        kotae=[N[0]]
        for x in range(l):
            kotae.append(ans[x])
            kotae.append(N[x+1])
        last=''.join(kotae)
        print(last)
        break