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(){
	char aa,bb,cc,dd;
	int a,b,c,d;
	scanf("%c%c%c%c",&aa,&bb,&cc,&dd);
	a=aa-'0';b=bb-'0';c=cc-'0';d=dd-'0';
	for(int i=0;i<2;i++){
		for(int j=0;j<2;j++){
			for(int k=0;k<2;k++){
				int x=a;
				if(i)x+=b;else x-=b;
				if(j)x+=c;else x-=c;
				if(k)x+=d;else x-=d;
				if(x==7){
					printf("%d%c%d%c%d%c%d=7",a,i?'+':'-',b,j?'+':'-',c,k?'+':'-',d);
					goto A;
				}
			}
		}
	}
	A:
	return 0;
}