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: Output Limit Exceeded)

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

void Standard_Input(int* a,int* b,int* c,int* d)
{
    int x;
    scanf("%d",&x);
    while(x>=10000||x<0)
    {
        scanf("%d",&x);
    }
    *d=x%10;x/=10;
    *c=x%10;x/=10;
    *b=x%10;x/=10;
    *a=x%10;x/=10;
}

int main()
{
    char op1='0',op2='0',op3='0';
    int a,b,c,d;
    while(1)
    {
        Standard_Input(&a,&b,&c,&d);
        if(a+b+c+d==7)
        {
            op1=op2=op3='+';
            printf("%d%c%d%c%d%c%d=7\n",a,op1,b,op2,c,op3,d);
        }
        else if(a+b+c-d==7)
        {
            op1=op2='+';
            op3='-';
            printf("%d%c%d%c%d%c%d=7\n",a,op1,b,op2,c,op3,d);
        }
        else if(a+b-c+d==7)
        {
            op1=op3='+';op2='-';
            printf("%d%c%d%c%d%c%d=7\n",a,op1,b,op2,c,op3,d);
        }
        else if(a+b-c-d==7)
        {
            op1='+';op2=op3='-';
            printf("%d%c%d%c%d%c%d=7\n",a,op1,b,op2,c,op3,d);
        }
        else if(a-b+c+d==7)
        {
            op1='-';op2=op3='+';
            printf("%d%c%d%c%d%c%d=7\n",a,op1,b,op2,c,op3,d);
        }
        else if(a-b+c-d==7)
        {
            op1=op3='+';op2='-';
            printf("%d%c%d%c%d%c%d=7\n",a,op1,b,op2,c,op3,d);
        }
        else if(a-b-c+d==7)
        {
            op1=op2='-';op3='+';
            printf("%d%c%d%c%d%c%d=7\n",a,op1,b,op2,c,op3,d);
        }
        else if(a-b-c-d==7)
        {
            op1=op2=op3='-';
            printf("%d%c%d%c%d%c%d=7\n",a,op1,b,op2,c,op3,d);
        }
        else
        {
            printf("no answer!please input another one:");
            continue;
        }
    }
    return 0;
}