# your code goes here
elements = map(int, input().split())
my_list = [e for e in elements if e >= 0]
my_list.sort()
print(my_list)
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmVsZW1lbnRzID0gbWFwKGludCwgaW5wdXQoKS5zcGxpdCgpKQpteV9saXN0ID0gW2UgZm9yIGUgaW4gZWxlbWVudHMgaWYgZSA+PSAwXQpteV9saXN0LnNvcnQoKQpwcmludChteV9saXN0KQo=