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.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();

		int d = n % 10;
		int c = (n - d) % 100/10;
		int b = (n - d - c * 10) % 1000/100;
		int a = n / 1000;
		
		int answer;
		
		for(int i =0; i < 2; i++) {
			
			for(int j = 0; j < 2; j++) {
				
				for(int k = 0; k < 2; k++) {
					answer = a;
					if(i == 0) {
						answer += b;
					} else {
						answer -= b;
					}
					if(j == 0) {
						answer += c;
					} else {
						answer -= c;
					}
					if(k == 0) {
						answer += d;
					} else {
						answer -= d;
					}
					if(answer == 7) {
						System.out.println(a + (i==0?"+":"-")
								+b + (j==0?"+":"-")
								+c + (k==0?"+":"-")+d + "=7");
						System.exit(0);
					}
				}
			}
			
		}
		
		

	}

}