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 (GCC 5.4.1) (judge verdict: Runtime Error)

#include<stdio.h>
int a[1][5]={0},i,j,n=1;
void check(int p){
	char c=p?'-':'+',d=p?'+':'-';
	int sum=a[0][1];
	for(i=2;i<5;i++){
		sum+=a[p][i];
	}
	for(i=0;i<5;i++){
		if(i!=1&&(sum-2*a[p][i]==7)){
			n=0;
			for(j=1;j<5;j++){
				if(j-1){printf("%c",j!=i||!i?c:d);}
				printf("%d",a[0][j]);
			}
			break;
		}
	}
}
int main(void){
	for(i=1;i<5;i++){
		scanf("%d",&a[0][i]);
		a[1][i]=-a[0][i];
	}
	check(0);
	if(n){check(1);}
	printf("=7");
	return 0;
}