Generate Combinations of Strings

You are tasked with generating all possible combinations of a string where each character can be included or excluded. The output should be a list of strings, sorted in lexicographical order. Given the input string 'abc', the output should be ['a', 'ab', 'abc', 'ac', 'b', 'bc', 'c']. Note that the empty string is not included in the result. Read the input string from standard input and output the resulting combinations. Example Input: abc Example Output: a ab abc ac b bc c