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 Java (OpenJDK 11.0.6) (judge verdict: Accepted)


import java.util.*;

public class Main {

	public static void main(String[] args) {
		Main main = new Main();
		main.run();
	}

	public void run() {
		Scanner sc = new Scanner(System.in);
		char c[] = sc.next().toCharArray();

		int d1=c[0]-'0';
		int d2=c[1]-'0';
		int d3=c[2]-'0';
		int d4=c[3]-'0';


		for(int i=0; i<2; i++) {
			for(int j=0; j<2; j++) {
				for(int k=0; k<2; k++) {
					int sum = d1;
					if(i%2==0) {
						sum+=d2;
					}else {
						sum-=d2;
					}
					if(j%2==0) {
						sum+=d3;
					}else {
						sum-=d3;
					}
					if(k%2==0) {
						sum+=d4;
					}else {
						sum-=d4;
					}
					if(sum==7) {
						System.out.print(d1);
						System.out.print(i%2==0 ? '+' : '-');
						System.out.print(d2);
						System.out.print(j%2==0 ? '+' : '-');
						System.out.print(d3);
						System.out.print(k%2==0 ? '+' : '-');
						System.out.print(d4);
						System.out.println("=7");
						sc.close();
						return;
					}
				}
			}
		}
		sc.close();
	}
}