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)

import sys
sys.setrecursionlimit(1000000000)
ii = lambda: int(input())
mis = lambda: map(int,input().split())
lmis = lambda: list(mis())
INF = float('inf')

def main():
    a,b,c,d=map(int,list(input()))
    for i in range(2):
        ans=str(a)
        if i: 
            ans=ans[:-2]
            ans+='-'
        else: ans+='+'
        ans+=str(b)
        for j in range(2):
            if j: 
                ans=ans[:-2]
                ans+='-'
            else: ans+='+'
            ans+=str(c)
            for k in range(2):
                if k: 
                    ans=ans[:-2]
                    ans+='-'
                else: ans+='+'
                ans+=str(d)
                if eval(ans)==7:
                    print(ans+'=7')
                    exit()


if __name__ == "__main__":
    main()