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>

int calc(int h, int val){
    return (h==0)*(-val)+(h!=0)*val;
}

int main()
{
    int a,b,c,d;
    int res,n;
    scanf("%d", &n);
    d = n % 10;
    c = (n/10)%10;
    b = (n/100)%10;
    a = n/1000;
    int i;
    for (i = 0; i < 8; i++){
        res = a+calc((i&4),b)+calc((i&2),c)+calc((i&1),d);
        if (res == 7)
            break;
    }
    printf("%d",a);

    if ((i&4)==0){
        printf("-");
    }else{
        printf("+");
    }
    printf("%d",b);

    if ((i&2)==0){
        printf("-");
    }else{
        printf("+");
    }
    printf("%d",c);

    if ((i&1)==0){
        printf("-");
    }else{
        printf("+");
    }
    printf("%d=7\n",d);
    return 0;
}