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 (3.8.2) (judge verdict: Runtime Error)

L=list(input())
a=int(L[0])
b=int(L[1])
c=int(L[2])
d=int(L[3])

import itertools

A=(1,-1)

def c(x):
	if x==1:
		return '+'
	else:
		return '-'

for v in itertools.product(A,repeat=3):
	s=a+b*v[0]+c*v[1]+d*v[2]
	if s==7:
		print(L[0]+c(v[0])+L[1]+c(v[1])+L[2]+c(v[2])+L[3]+'=7')
		exit()