output_description: Print the formula you made, including the part `=7`.
  
  Use the signs `+` and `-`.
  
  Do not print a space between a digit and a sign.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      ABCD
attempt: package main
  
  import (
  	"fmt"
  	"strconv"
  )
  
  func main() {
  	var inputLine string
  	fmt.Scan(&inputLine)
  	runeS := []rune(inputLine)
  	var nums []int
  	for _, c := range runeS {
  		n, _ := strconv.Atoi(string(c))
  		nums = append(nums, n)
  	}
  
  	var temp int
  	var s string
  	for i := 0; i < (1 << uint(len(nums)-1)); i++ {
  		temp = nums[0]
  		s = strconv.Itoa(nums[0])
  		for j := 0; j < (len(nums) - 1); j++ {
  			if (i>>uint(j))&1 == 1 {
  				temp += nums[j+1]
  				s += "+" + strconv.Itoa(nums[j+1])
  			} else {
  				temp -= nums[j+1]
  				s += "-" + strconv.Itoa(nums[j+1])
  			}
  		}
  		if temp == 7 {
  			s += "=7"
  			fmt.Println(s)
  			break
  		}
  	}
  }
  
problem_description: 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.
samples: [{"input": "1222", "output": "1+2+2+2=7\n    \n\nThis is the only valid solution.\n\n* * *"}, {"input": "0290", "output": "0-2+9+0=7\n    \n\n0 - 2 + 9 - 0 = 7 is also a valid solution.\n\n* * *"}, {"input": "3242", "output": "3+2+4-2=7"}]