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 Julia (0.5.0) (judge verdict: Accepted)

if isfile("mystdin.txt");mystdin=open("mystdin.txt","r");redirect_stdin(mystdin);end
pI(x)=parse(Int,x)
pM(x::Array{SubString{String},1})=map(pI,x)
function main()
  l=chomp(readline())
  a,b,c,d=[pI(i) for i=l]
  if a+b+c+d==7
    println(a,"+",b,"+",c,"+",d,"=7")
  elseif a+b+c-d==7
    println(a,"+",b,"+",c,"-",d,"=7")
  elseif a+b-c+d==7
    println(a,"+",b,"-",c,"+",d,"=7")
  elseif a+b-c-d==7
    println(a,"+",b,"-",c,"-",d,"=7")
  elseif a-b+c+d==7
    println(a,"-",b,"+",c,"+",d,"=7")
  elseif a-b+c-d==7
    println(a,"-",b,"+",c,"-",d,"=7")
  elseif a-b-c+d==7
    println(a,"-",b,"-",c,"+",d,"=7")
  elseif a-b-c-d==7
    println(a,"-",b,"-",c,"-",d,"=7")
  end
end
main()
if isdefined(Base, :mystdin);close(mystdin);end