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 main(){
  char s[4],equ[10];
  scanf("%s",s);
  int i,j;
  for(i=0;i<4;i++)
    equ[2*i]=s[i];
  equ[7]='=';
  equ[8]='7';
  for(i=0;i<8;i++){
    int n=i,sum=s[0]-'0';
    for(j=1;j<=3;j++){
      if(n%2==0){
        sum+=s[j]-'0';
        equ[2*j-1]='+';
      }
      else{
        sum-=s[j]-'0';
        equ[2*j-1]='-';
      }
      n/=2;
    }
    if(sum==7){
      for(j=0;j<9;j++)
        printf("%c",equ[j]);
      return 0;
    }
  }
  return 0;
}