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)

// C - Train Ticket
#include <stdio.h>
#include <string.h>

int main(void){
    char abcd[4], op[3];
    int abcdInt[4], i, j, temp, sum=0;
    scanf("%s", abcd);
    for(i=0; i<4; i++){
        abcdInt[i] = abcd[i]-'0';
    }
    for(i=0; i<(1<<4); i++){
        int sum=abcdInt[0];
        for(j=0; j<3; j++){
            if(i & (1<<j)){
                op[j]='+';
                sum+=abcdInt[j+1];
            }else{
                op[j]='-';
                sum-=abcdInt[j+1];
            }
        }
        if(sum==7) break;
    }

    for(i=0; i<3; i++){
        printf("%d%c", abcdInt[i], op[i]);
    }
    printf("%d=7\n", abcdInt[3]);
    return 0;
}