def find_combinations(nums, target):
    def find_sums(current_sum, start, path):
        if current_sum == target:
            result.append('+'.join(path))
        elif current_sum < target:
            for i in range(start, len(nums)):
                find_sums(current_sum + nums[i], i + 1, path + [str(nums[i])])
    
    nums = list(map(int, input().split()))
    target = int(input())
    result = []
    find_sums(0, 0, [])
    
    if result:
        for r in result:
            print(r)
    else:
        print("not found")

find_combinations([], 0)