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 Kotlin (1.0.0) (judge verdict: Accepted)

fun main(args: Array<String>) {
    Program().solve()
}

class Program {
    fun solve() {
        val sc = MyScanner()
        val s = sc.next()

        for (i in 0 until 8) {
            var ss = s[0] - '0'
            val op1 = if (i and 1 > 0) '+' else '-'
            val op2 = if (i and 2 > 0) '+' else '-'
            val op3 = if (i and 4 > 0) '+' else '-'
            ss += (s[1] - '0') * (if (i and 1 > 0) 1 else -1)
            ss += (s[2] - '0') * (if (i and 2 > 0) 1 else -1)
            ss += (s[3] - '0') * (if (i and 4 > 0) 1 else -1)
            if (ss == 7) {
                println("${s[0]}$op1${s[1]}$op2${s[2]}$op3${s[3]}=7")
                return
            }
        }
    }
}


class MyScanner() {
    private var index = 0
    private var line = listOf<String>()

    fun next(): String {
        while (line.size <= index) {
            line = readLine()!!.split(' ')
            index = 0
        }
        return line[index++]
    }

    fun nextInt() = next().toInt()
    fun nextLong() = next().toLong()
    fun nextDouble() = next().toDouble()
    fun nextCharArray() = next().toCharArray()
    fun nextChar() = next()[0]

    fun strList(): List<String> {
        index = line.size
        return readLine()!!.split(' ')
    }

    fun intList() = strList().map { it.toInt() }
    fun longList() = strList().map { it.toLong() }
    fun doubleList() = strList().map { it.toDouble() }
}