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: Wrong Answer)

// header {{{
#include <bits/stdc++.h>
using namespace std;

// {U}{INT,LONG,LLONG}_{MAX,MIN}
#define INF         INT_MAX/3
#define LLINF       LLONG_MAX/3
#define MOD         (1000000007LL)
#define MODA(a, b)  a=((a)+(b))%MOD
#define MODP(a, b)  a=((a)*(b))%MOD
#define inc(i, l, r)   for(int i=(l);i<(r);i++)
#define dec(i, l, r)   for(int i=(r)-1;i>=(l);i--)
#define pb          push_back
#define se          second
#define fi          first
#define mset(a, b)  memset(a, b, sizeof(a))

using LL  = long long;
using G   = vector<vector<int>>;

int di[] = {0, -1, 0, 1};
int dj[] = {1, 0, -1, 0};
// }}}

int main() {
    cin.tie(0);ios::sync_with_stdio(false);
    string s;cin >> s;
    int a = s[0] - '0';
    int b = s[1] - '0';
    int c = s[2] - '0';
    int d = s[3] - '0';

    if(a+b+c+d == 7) printf("%d+%d+%d+%d=7\n", a, b, c, d); return 0;
    if(a+b+c-d == 7) printf("%d+%d+%d-%d=7\n", a, b, c, d); return 0;
    if(a+b-c+d == 7) printf("%d+%d+%d-%d=7\n", a, b, c, d); return 0;
    if(a+b-c-d == 7) printf("%d+%d-%d-%d=7\n", a, b, c, d); return 0;
    if(a-b+c+d == 7) printf("%d-%d+%d+%d=7\n", a, b, c, d); return 0;
    if(a-b+c-d == 7) printf("%d-%d+%d-%d=7\n", a, b, c, d); return 0;
    if(a-b-c+d == 7) printf("%d-%d-%d+%d=7\n", a, b, c, d); return 0;
    if(a-b-c-d == 7) printf("%d-%d-%d-%d=7\n", a, b, c, d); return 0;
}