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 N = scala.io.StdIn.readLine.toArray

	val a1 = N(0).toInt - 48
	val a2 = N(1).toInt - 48
	val a3 = N(2).toInt - 48
	val a4 = N(3).toInt - 48

	if(a1 + a2 + a3 + a4 == 7){
		println(s"$a1+$a2+$a3+$a4=7")
	}else if(a1 + a2 + a3 - a4 == 7){
		println(s"$a1+$a2+$a3-$a4=7")
	}else if(a1 + a2 - a3 + a4 == 7){
		println(s"$a1+$a2-$a3+$a4=7")
	}else if(a1 + a2 - a3 - a4 == 7){
		println(s"$a1+$a2-$a3-$a4=7")
	}else if(a1 - a2 + a3 + a4 == 7){
		println(s"$a1-$a2+$a3+$a4=7")
	}else if(a1 - a2 + a3 - a4 == 7){
		println(s"$a1-$a2+$a3-$a4=7")
	}else if(a1 - a2 - a3 + a4 == 7){
		println(s"$a1-$a2-$a3+$a4=7")
	}else if(a1 - a2 - a3 - a4 == 7){
		println(s"$a1-$a2-$a3-$a4=7")
	}
}