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

#include <bits/stdc++.h>
#include <stdlib.h>
#define rep(i, n) for (int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;



/*1234みたいな数字があってまず%10することで末尾のけたを取り出す。その後割る10
　することで取り出した部分を除くことができる*/
void seven(int a,int i, vector<int> &kurai){


    if (a > 0 && i < 4)
        
    {
        kurai[i] = a % 10;
        a /= 10;
        
        i++;
        seven(a, i, kurai);   
    }

    return ;

}

int main()
{
    int integer;
    cin >> integer;
    vector<int> kurai(3);
    seven(integer,0,kurai);

    int d = kurai[0];
    int c = kurai[1];
    int b = kurai[2];
    int a = kurai[3];
     


if(a+b+c+d == 7){
    cout << a <<"+"<< b << "+" <<c <<"+" <<d <<"=7" << endl;
}
else if (a + b - c + d == 7) {
    cout << a << "+" << b << "-" << c << "+" << d << "=7" << endl;
}

else if (a + b + c - d == 7) {
    cout << a << "+" << b << "+" << c << "-" << d << "=7" << endl;
}
else if (a + b - c - d == 7) {
    cout << a << "+" << b << "-" << c << "-" << d << "=7" << endl;
}
else if (a - b + c + d == 7) {
    cout << a << "-" << b << "+" << c << "+" << d << "=7" << endl;
}
else if (a - b - c + d == 7) {
    cout << a << "-" << b << "-" << c << "+" << d << "=7" << endl;
}
else if (a - b + c - d == 7){
    cout << a << "-" << b << "+" << c << "-" << d << "=7" << endl;
} 
else if (a - b - c - d == 7){
    cout << a << "-" << b << "-" << c << "-" << d << "=7" << endl;
}

}