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 PyPy3 (2.4.0) (judge verdict: Accepted)

#!/usr/bin/env pypy3
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))
import itertools


def main():
    S=input()
    
    def calc(L):
        temp=int(S[0])
        for i in range(3):
            a=1
            if L[i]==0:
                a=-1
            temp+=int(S[i+1])*a
        return temp
    
    ans=S[0]
    for ite in itertools.product([0,1], repeat=3):
        if calc(ite)==7:
            for i in range(3):
                if ite[i]==1:
                    ans+="+"
                else:
                    ans+="-"
                ans+=S[i+1]
            break
    print(ans+"=7")
    
            
        
    

main()