#!/usr/bin/python3
#
# This program reads a string of digits S as a command-line argument,
# and inserts plus (+) and minus signs (-) in the sequence of digits
# so as to create an expression that evaluates to zero. The program
# should output a resulting expression, if one such expression exists,
# or "None" if no such expression exists.
# 
# For example, if S is "201015900001", then the program could output
# "+2+0+10+1-5-9+0+0+0+0+1". Instead, if S is "200015800001", then the
# program should output "None".
#
# This program tends to produce long expressions (with many operands).
# 
import sys

def solve_puzzle(s, n):
    v = int(s)
    if v == n:
        return '+' + s

    if v == -n:
        return '-' + s

    if v < abs(n):
        return None

    for i in range(1,len(s)):
        front = s[0:i]
        back = s[i:]
        target = int(front)
        back_solution = solve_puzzle(back,n-target)
        if back_solution != None:
            return '+' + front + back_solution
        back_solution = solve_puzzle(back,n+target)
        if back_solution != None:
            return '-' + front + back_solution

    return None

print(solve_puzzle(sys.argv[1],0))