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 Ruby (2.3.3) (judge verdict: Accepted)

#set
a,b,c,d = gets.chomp.split("").map(&:to_i)


#main
answer_1 = a + b + c + d
if answer_1 == 7 then
  print ("#{a}+#{b}+#{c}+#{d}=7\n")
  exit
end

answer_2 = a - b + c + d
if answer_2 == 7 then
  print ("#{a}-#{b}+#{c}+#{d}=7\n")
  exit
end

answer_3 = a + b - c + d
if answer_3 == 7 then
  print ("#{a}+#{b}-#{c}+#{d}=7\n")
  exit
end

answer_4 = a + b + c - d
if answer_4 == 7 then
  print ("#{a}+#{b}+#{c}-#{d}=7\n")
  exit
end

answer_5 = a - b - c + d
if answer_5 == 7 then
  print ("#{a}-#{b}-#{c}+#{d}=7\n")
  exit
end

answer_6 = a - b + c - d
if answer_6 == 7 then
  print ("#{a}-#{b}+#{c}-#{d}=7\n")
  exit
end

answer_7 = a + b - c - d
if answer_7 == 7 then
  print ("#{a}+#{b}-#{c}-#{d}=7\n")
  exit
end

answer_8 = a - b - c - d
if answer_8 == 7 then
  print ("#{a}-#{b}-#{c}-#{d}=7\n")
  exit
end