5 ESSENTIAL ELEMENTS FOR 12345ASDF

We search for the placement p of each and every character in the input in a string S exactly where the keyboard rows are interleaved: the main 4 people are '1QAZ' (initial column on the keyboard), the following four characters are '2WSX' (2nd column in the keyboard) etc. Unused positions are padded with underscores and the last kinds are simply jus