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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)



import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main{
    static boolean is7(int[] ABCD, String op){
        int cul;
        cul = ABCD[0];
        for(int i=0; i<op.length(); i++) {
            if (op.charAt(i) == '+'){
                cul += ABCD[i+1]; }
                else{
                cul -= ABCD[i+1];
            }
        }
            if(cul == 7) return true;

        return false;
    }

    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str = br.readLine().trim();
        int[] ABCD = new int[str.length()];
        for(int i=0; i<str.length(); i++){
            ABCD[i] = Integer.parseInt(""+str.charAt(i));
        }
        String[] ops = {"---", "--+","-+-", "-++",
                "+--", "+-+","++-", "+++",};
        for(int i=0; i<8; i++){
            if(is7(ABCD, ops[i])){
                System.out.println(ABCD[0] +""+ ops[i].charAt(0) + ABCD[1] + ops[i].charAt(1)
                        + ABCD[2] + ops[i].charAt(2) + ABCD[3] + "=7");
                break;
            }
        }

    }
}