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(void) {
	int N;
	scanf("%d",&N);
	int A,B,C,D,X,Y,Z;
	int i,tmp=0;
	A=N/1000;
	B=(N-A*1000)/100;
	C=(N-A*1000-B*100)/10;
	D=(N-A*1000-B*100-C*10);
	for(i=0;i<8;i++){
		if(i==0){
			Z=A+B+C+D;
		}else if(i==1){
			Z=A+B+C-D;
		}else if(i==2){
			Z=A+B-C+D;
		}else if(i==3){
			Z=A+B-C-D;
		}else if(i==4){
			Z=A-B+C+D;
		}else if(i==5){
			Z=A-B+C-D;
		}else if(i==6){
			Z=A-B-C+D;
		}else if(i==7){
			Z=A-B-C-D;
		}
		if(Z==7){
			tmp=i;
			break;
		}
	}
	if(tmp==0){
		printf("%d+%d+%d+%d=%d",A,B,C,D,Z);
	}else if(tmp==1){
		printf("%d+%d+%d-%d=%d",A,B,C,D,Z);
	}else if(tmp==2){
		printf("%d+%d-%d+%d=%d",A,B,C,D,Z);
	}else if(tmp==3){
		printf("%d+%d-%d-%d=%d",A,B,C,D,Z);
	}else if(tmp==4){
		printf("%d-%d+%d+%d=%d",A,B,C,D,Z);
	}else if(tmp==5){
		printf("%d-%d+%d-%d=%d",A,B,C,D,Z);
	}else if(tmp==6){
		printf("%d-%d-%d+%d=%d",A,B,C,D,Z);
	}else if(tmp==7){
		printf("%d-%d-%d-%d=%d",A,B,C,D,Z);
	}
	return 0;
}