They give us the flag, right? So we just copy and paste the "flag", `tpctf{nеv3r_7h15_3z}`, and see that it fails. What?! Let me type it out letter by letter. Hey, it works! `tpctf{nev3r_7h15_3z}`
Note: the second 'e' in the "flag" is actually a ['CYRILLIC SMALL LETTER IE' (U+0435)](http://www.fileformat.info/info/unicode/char/0435/index.htm)