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>){
    val a = readLine()!!.toCharArray().map { it.toString() }.map { it.toInt() }
    for(i in 0 until (1 shl 3)){
        val op = Array(3){""}
        var ans = a[0]
        for (j in 0 until 3){
            if(i.shr(j).and(1) == 1){
                op[j] = "+"
                ans += a[j+1]
            } else {
                op[j] = "-"
                ans -= a[j+1]
            }
        }
        if(ans == 7) {
            println("${a[0]}${op[0]}${a[1]}${op[1]}${a[2]}${op[2]}${a[3]}=7")
            break
        }
    }
}