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 = int(input())
#l = list(map(int, input().split()))

'''
A=[]
B=[]
for i in range():
    a, b = map(int, input().split())
    A.append(a)
    B.append(b)'''

import sys
input = sys.stdin.readline

s = input()
a,b,c,d=[int(s[i]) for i in range(4)]
op = -1
ans = []
for i in range(2):
    for j in range(2):
        for m in range(2):
            if (a+b*op**i+c*op**j+d*op**m)==7:
                ans.append(i)
                ans.append(j)
                ans.append(m)
for i in range(3):
    if ans[i]==0:
        ans[i]="+"
    else:
        ans[i]="-"
print(s[0]+ans[0]+s[1]+ans[1]+s[2]+ans[2]+s[3]+"=7")