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: Wrong Answer)

#include<stdio.h>
#include<math.h>

int main(){
        char s[8], ans[8];
        scanf("%s", s);
        int n[4];
        for(int i=0; i<4; i++){
                n[i] = s[i] - '0';
                ans[i*2] = s[i];
        }

        for(int i=0; i<8; i++){
                int cnt = n[0];
                for(int j=0; j<3; j++){
                        cnt += n[j+1] * pow(-1, (i>>j)&1);
                        ans[j*2+1] = 44 + pow(-1, !(i>>j)|0);
                }
                if(cnt==7) break;
        }
        printf("%s=7\n", ans);
        return 0;
}