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 <stdlib.h>

int main(void) {
    int a,b,c,d,i,j,k;
    char s[5],a1,a2,a3;
    scanf("%s",s);
    a = s[0] - 48;
    b = s[1] - 48;
    c = s[2] - 48;
    d = s[3] - 48;
    for (i = 1;i > -2;i -= 2) {
        if (i == 1) {
            a1 = '+';
        } else {
            a1 = '-';
        }
        for (j = 1;j > -2;j -= 2) {
            if (j == 1) {
                a2 = '+';
            } else {
                a2 = '-';
            }
            for (k = 1;k > -2;k -= 2) {
                if (k == 1) {
                    a3 = '+';
                } else {
                    a3 = '-';
                }
                if (a + b * i + c * j + d * k == 7) {
                    printf("%d%c%d%c%d%c%d\n",a,a1,b,a2,c,a3,d);
                    exit(0);
                }
            }
        }
    }
    return 0;
}