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 <algorithm>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <deque>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <utility>
#include <vector>

#define CK(N, A, B) (A <= N && N < B)
#define REP(i, a, b) for (int i = a; i < b; i++)
#define RREP(i, a, b) for (int i = (b - 1); a <= i; i--)
#define F first
#define S second
#define ll long long

const int INF = 1e9;
const long long LLINF = 1e18;

using namespace std;

int dy[] = {0,1,0,-1};
int dx[] = {1,0,-1,0};
int dy8[] = {0,1,1,1,0,-1,-1,-1};
int dx8[] = {1,1,0,-1,-1,-1,0,1};

/*==================================================*/
/*variable*/
string S;
/*==================================================*/
/*function*/

/*==================================================*/

int main() {
    cin>>S;

    int a = (S[0]-'0');
    int b = (S[1]-'0');
    int c = (S[2]-'0');
    int d = (S[3]-'0');

    REP(i,0,2){
        int sum1;
        string op1;
        if(i == 0) sum1 = a + b, op1 = "+";
        else sum1 = a - b, op1 = "-";
        REP(j,0,2){
            int sum2;
            string op2;
            if(j == 0) sum2 = sum1 + c, op2 = "+";
            else sum2 = sum1 - c, op2 = "-";
            REP(k,0,2){
                int sum3;
                string op3;
                if(k == 0) sum3 = sum2 + d, op3 = "+";
                else sum3 = sum2 - d, op3 = "-";

                //test
                //cout<<sum3<<endl;

                if(sum3 == 7){
                    cout<<a<<op1<<b<<op2<<c<<op3<<d<<"=7"<<endl;
                    return 0;
                }
            }
        }
    }
    return 0;
}