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.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      String s = sc.next();
      int a = Integer.parseInt(s.substring(0,1));
      int b = Integer.parseInt(s.substring(1,2));
      int c = Integer.parseInt(s.substring(2,3));
      int d = Integer.parseInt(s.substring(3,4));
      int x1 = a+b+c+d;
      int x2 = a-b+c+d;
      int x3 = a+b-c+d;
      int x4 = a+b+c-d;
      int x5 = a-b-c+d;
      int x6 = a-b+c-d;
      int x7 = a+b-c-d;
      int x8 = a-b-c-d;
      String aa = String.valueOf(a);
      String bb = String.valueOf(b);
      String cc  =String.valueOf(c);
      String dd = String.valueOf(d);
      if(x1==7) System.out.println(aa+"+"+bb+"+"+cc+"+"+dd+"=7");
      else if (x2==7) System.out.println(aa+"-"+bb+"+"+cc+"+"+dd+"=7");
      else if (x3==7) System.out.println(aa+"+"+bb+"-"+cc+"+"+dd+"=7");
      else if (x4==7) System.out.println(aa+"+"+bb+"+"+cc+"-"+dd+"=7");
      else if (x5==7) System.out.println(aa+"-"+bb+"-"+cc+"+"+dd+"=7");
      else if (x6==7) System.out.println(aa+"-"+bb+"+"+cc+"-"+dd+"=7");
      else if (x7==7) System.out.println(aa+"+"+bb+"-"+cc+"-"+dd+"=7");
      else if (x8==7) System.out.println(aa+"-"+bb+"-"+cc+"-"+dd+"=7");
    }
}