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: Wrong Answer)

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		//数値
		String str = sc.next();
		int n[] = new int[4];

        for(int i = 0; i < 4; i++){
        	n[i] = Integer.parseInt(str.substring(i, i + 1));
		    int A = n[0];
		    int B = n[1];
		    int C = n[2];
		    int D = n[3];
		    if(A+B+C+D==7) {
		    	System.out.println(A+"+"+B+"+"+C+"+"+D+"=7");
		    	return;
		    	}
		    else if(A+B+C-D==7) {
		    	System.out.println(A+"+"+B+"+"+C+"-"+D+"=7");
		    	return;
		    	}
		    else if(A+B-C+D==7) {
		    	System.out.println(A+"+"+B+"-"+C+"+"+D+"=7");
		    	return;
		    	}
		    else if(A+B-C-D==7) {
		    	System.out.println(A+"+"+B+"-"+C+"-"+D+"=7");
		    	return;
		    	}
		    
		    else if(A-B+C+D==7) {
		    	System.out.println(A+"-"+B+"+"+C+"+"+D+"=7");
		    	return;
		    	}
		    else if(A-B+C-D==7) {
		    	System.out.println(A+"-"+B+"+"+C+"-"+D+"=7");
		    	return;
		    	}
		    else if(A-B-C+D==7) {
		    	System.out.println(A+"-"+B+"-"+C+"+"+D+"=7");
		    	return;
		    	}
		    else if(A-B-C-D==7) {
		    	System.out.println(A+"-"+B+"-"+C+"-"+D+"=7");
		    	return;
		    	}
		}
		}
}