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 <stdio.h>
#include <stdlib.h>

int main()
{
    int number[4],i,j,result;
    char op_1,op_2,op_3;
    for(i=0; i<4; i++)
        scanf("%1d",&number[i]);
    for(i=0; i<8; i++)
    {
        j=i;
        result=number[0];
        if(j/4==0)
        {
            result+=number[1];
            op_1='+';
        }
        else
        {
            result-=number[1];
            op_1='-';
        }
        j=j%4;
        if(j/2==0)
        {
            result+=number[2];
            op_2='+';
        }
        else
        {
            result-=number[2];
            op_2='-';
        }
        j=j%2;
        if(j==0)
        {
            result+=number[3];
            op_3='+';
        }
        else
        {
            result-=number[3];
            op_3='-';
        }
        if(result==7)
            break;
    }
    printf("%d%c%d%c%d%c%d=7\n",number[0],op_1,number[1],op_2,number[2],op_3,number[3]);
    return 0;
}