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>
int main(void){
    int n;
    int a,b,c,d;
    int i,j,k,l;
    int sum=0;
    scanf("%d",&n);
    if(n<1000){
        a=0;
    }else{
        a=n/1000;
        n%=1000;
    }
    if(n<100){
        b=0;
    }else{
        b=n/100;
        n%=100;
    }
    if(n<10){
        c=0;
    }else{
        c=n/10;
        n%=10;
    }
    d=n;
    for(i=0;i<2;i++){
        sum=0;
        if(i==0){
            sum=a;
        }else{
            sum=-a;
        }
        for(j=0;j<2;j++){
            if(j==0){
                sum=sum+b;
            }else{
                sum=sum-b;
            }
            for(k=0;k<2;k++){
                if(k==0){
                    sum=sum+c;
                }else{
                    sum=sum-c;
                }
                for(l=0;l<2;l++){
                    if(l==0){
                        sum=sum+d;
                    }else{
                        sum=sum-d;
                    }
                    if(sum==7){
                        if(i==0){
                            printf("+%d",a);
                        }else{
                            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");
                        return 0;
                    }
                }

            }
        }
    }
    return 0;
}