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>
#include <string.h>

int main(){
  int a, b, c, d, i, op1, op2, op3;
  scanf("%d%d%d%d", &a, &b, &c, &d);
  
  for(i=0;i<8;i++){
    op1=((i>>2)%2)?1:-1;
    op2=((i>>1)%2)?1:-1;
    op3=((i>>0)%2)?1:-1;
    if(a+(op1)*b+(op2)*c+(op3)*d==7){
      printf("%d%c%d%c%d%c%d=7\n", a,
                                   op1==1?'+':'-',
                                   b,
                                   op2==1?'+':'-',
                                   c,
                                   op3==1?'+':'-',
                                   d);
      break;
    }
  }
  
}