Hello there :)

In past contest(Codeforces Round #519 by Botan Investments) in Problem D i wanted to hack a solution and i wrote a code that make a text file and when i submitted that file, I found that it can't be more than 256 KB so i wrote this (My code) code for generating test and i get this error Validator 'validator.exe' returns exit code 3 [FAIL Expected EOLN (stdin)]. I don't have any idea what is it, so could you help me?