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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<cstdio>

int main(){
	int n,a,b,c,d;
	while(~scanf("%d",&n)){
		a=n/1000;
		b=(n/100)%10;
		c=(n%100)/10;
		d=n%10;
		if((a+b+c+d)==7)    	
			printf("%d+%d+%d+%d=%d\n",a,b,c,d,a+b+c+d);
		else if((a+b+c-d)==7)
			printf("%d+%d+%d-%d=%d\n",a,b,c,d,a+b+c-d);
		else if((a+b-c-d)==7)
			printf("%d+%d-%d-%d=%d\n",a,b,c,d,a+b-c-d);
		else if((a-b-c-d)==7)
			printf("%d-%d-%d-%d=%d\n",a,b,c,d,a-b-c-d);
		else if((a-b+c+d)==7)
			printf("%d-%d+%d+%d=%d\n",a,b,c,d,a-b+c+d);
		else if((a+b-c+d)==7)
			printf("%d+%d-%d+%d=%d\n",a,b,c,d,a+b-c+d);
		else if((a-b+c-d)==7)
			printf("%d-%d+%d-%d=%d\n",a,b,c,d,a-b+c-d);
		else if((a-b-c+d)==7)
			printf("%d-%d-%d+%d=%d\n",a,b,c,d,a-b-c+d);	
			}
}