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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main(){
	int x, i;
	int a[10];
	cin>>x;
	for(i=3; i>=0; i--){
		a[i]=x%10;
		x/=10;
	}
	if(a[0]+a[1]+a[2]+a[3]==7) cout<<a[0]<<'+'<<a[1]<<'+'<<a[2]<<'+'<<a[3]<<"=7"<<endl;
	else if(a[0]-a[1]+a[2]+a[3]==7) cout<<a[0]<<'-'<<a[1]<<'+'<<a[2]<<'+'<<a[3]<<"=7"<<endl;
	else if(a[0]+a[1]-a[2]+a[3]==7) cout<<a[0]<<'+'<<a[1]<<'-'<<a[2]<<'+'<<a[3]<<"=7"<<endl;
	else if(a[0]+a[1]+a[2]-a[3]==7) cout<<a[0]<<'+'<<a[1]<<'+'<<a[2]<<'-'<<a[3]<<"=7"<<endl;
	else if(a[0]-a[1]-a[2]+a[3]==7) cout<<a[0]<<'-'<<a[1]<<'-'<<a[2]<<'+'<<a[3]<<"=7"<<endl;
	else if(a[0]-a[1]+a[2]-a[3]==7) cout<<a[0]<<'-'<<a[1]<<'+'<<a[2]<<'-'<<a[3]<<"=7"<<endl;
	else if(a[0]+a[1]-a[2]-a[3]==7) cout<<a[0]<<'+'<<a[1]<<'-'<<a[2]<<'-'<<a[3]<<"=7"<<endl;
	else if(a[0]-a[1]-a[2]-a[3]==7) cout<<a[0]<<'-'<<a[1]<<'-'<<a[2]<<'-'<<a[3]<<"=7"<<endl;
	return 0;
}