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 Scala (2.11.7) (judge verdict: Accepted)

object Main extends App {
  val input = io.Source.stdin.getLines.toIndexedSeq.head
  val A=input(0)-'0'
  val B=input(1)-'0'
  val C=input(2)-'0'
  val D=input(3)-'0'
  
  if     (A+B+C+D==7) println(A+"+"+B+"+"+C+"+"+D+"=7")
  else if(A+B+C-D==7) println(A+"+"+B+"+"+C+"-"+D+"=7")
  else if(A+B-C+D==7) println(A+"+"+B+"-"+C+"+"+D+"=7")
  else if(A+B-C-D==7) println(A+"+"+B+"-"+C+"-"+D+"=7")
  else if(A-B+C+D==7) println(A+"-"+B+"+"+C+"+"+D+"=7")
  else if(A-B+C-D==7) println(A+"-"+B+"+"+C+"-"+D+"=7")
  else if(A-B-C+D==7) println(A+"-"+B+"-"+C+"+"+D+"=7")
  else if(A-B-C-D==7) println(A+"-"+B+"-"+C+"-"+D+"=7")
}