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 main(int argc,char* argv[]){
    char a,b,c,d;
    int t[4];
    int i,j,k;
    int ans=0;
    scanf("%c%c%c%c",&a,&b,&c,&d);
    t[0]=a-'0';
    t[1]=b-'0';
    t[2]=c-'0';
    t[3]=d-'0';
    for(i=0;i<2;i++){
        for(j=0;j<2;j++){
            for(k=0;k<2;k++){
                ans=t[0];
                if(i==0)ans+=t[1];
                else ans-=t[1];
                if(j==0)ans+=t[2];
                else ans-=t[2];
                if(k==0)ans+=t[3];
                else ans-=t[3];
                if(ans==7){
                    printf("%c%c%c%c%c%c%c=7\n",a,(i==0)?'+':'-',b,(j==0)?'+':'-',c,(k==0)?'+':'-',d);
                    return 0;
                }
            }
        }
    }
    return 0;
}