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: Accepted)

#include <stdio.h>
int tintin(int a){return a==0?-1:1;}
char ymdtr(int a){return a==0?'-':'+';}
int main(void){
    char po[10];
    scanf("%s",po);
    int A[4];
    for(int i=0;i<4;i++)A[i]=po[i]-'0';
    for(int i=0;i<=1;i++)for(int j=0;j<=1;j++)for(int k=0;k<=1;k++){
        if(A[0]+A[1]*tintin(i)+A[2]*tintin(j)+A[3]*tintin(k)==7){
            printf("%d%c%d%c%d%c%d=7",A[0],ymdtr(i),A[1],ymdtr(j),A[2],ymdtr(k),A[3]);
            return 0;
        }
    }
    return 0;
}