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: Runtime Error)



import java.util.Scanner;

public class Main {

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

		// 整数の入力
		int n = sc.nextInt();
		String val = String.valueOf(n);

		int n1 = Integer.parseInt(String.valueOf(val.charAt(0)));
		int n2 = Integer.parseInt(String.valueOf(val.charAt(1)));
		int n3 = Integer.parseInt(String.valueOf(val.charAt(2)));
		int n4 = Integer.parseInt(String.valueOf(val.charAt(3)));

		if (n1 + n2 + n3 + n4 == 7){
			System.out.println(n1 + "+" + n2 + "+" + n3 + "+" + n4 + "=7");
		}else if(n1 - n2 + n3 + n4 == 7){
			System.out.println(n1 + "-" + n2 + "+" + n3 + "+" + n4 + "=7");
		}else if(n1 + n2 - n3 + n4 == 7){
			System.out.println(n1 + "+" + n2 + "-" + n3 + "+" + n4 + "=7");
		}else if(n1 + n2 + n3 - n4 == 7){
			System.out.println(n1 + "+" + n2 + "+" + n3 + "-" + n4 + "=7");
		}else if(n1 + n2 - n3 - n4 == 7){
			System.out.println(n1 + "+" + n2 + "-" + n3 + "-" + n4 + "=7");
		}else if(n1 - n2 + n3 - n4 == 7){
			System.out.println(n1 + "-" + n2 + "+" + n3 + "-" + n4 + "=7");
		}else if(n1 - n2 - n3 + n4 == 7){
			System.out.println(n1 + "-" + n2 + "-" + n3 + "+" + n4 + "=7");
		}else if(n1 - n2 - n3 - n4 == 7){
			System.out.println(n1 + "-" + n2 + "-" + n3 + "-" + n4 + "=7");
		}

		sc.close();
	}

}