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: Wrong Answer)

#include <stdio.h>
#include <stdlib.h>

int main(void){

char p[4];
scanf("%s",p);
int a = p[0] - '0';
int b = p[1] - '0';
int c = p[2] - '0';
int d = p[3] - '0';


int *q = malloc(sizeof(int)*2);
q[0] = b; q[1] = (-1)*b;
int *r = malloc(sizeof(int)*2);
r[0] = c; r[1] = (-1)*c;
int *s = malloc(sizeof(int)*2);
s[0] = d; s[1] = (-1)*d;


int flag=0;

	for(int j=0;j<2;j++){
		if(flag==1) break;
		for(int k=0;k<2;k++){
			if(flag==1) break;
			for(int l=0;l<2;l++){
				if(a+q[j]+r[k]+s[l] == 7){
					printf("%d",a);
					if(j==0) printf("+%d",b);
					else printf("-%d",b);
					if(k==0) printf("+%d",c);
					else printf("-%d",c);
					if(l==0) printf("+%d",d);
					else printf("-%d",d);
					printf("==7\n");
					flag = 1;
					break;
				}

			}
		}

	}





}