the doctor said that the result of this should be a normal english text

you actually didnt gave an understandable text the result of the decryption should be an normal text in english language

you just applied a random cipher

You must write clear, meaningful, consistent. Show each step of your work to receive full credit. If you use a programming platform for a computation, write the set of commands that produced the result. Upload a SINGLE PDF file. It must be readable

Decrypt your own ciphertext obtained from a Substitution Cipher. Note that there may be meaningless words at the beginning or at the end since the plaintext is divided into equal parts.

PTMNYJLCUPCCJAUBCXMAAJDPSGSYLJNMAMPTZGLCUMPQBUQMZGCDLPGSU PSZUNGKUZFUTUMPFGGYBJDLCGNYGLAUMSCXGZUCGLYMQQULMACXUCUQQA UMSUQMZGAEUQQJEMPTSJEPXGLUPTGLUAEGQQUAAXGZJDQSPJAUMSCXGZU CGLYMQQULUQMZGCXJDTXCAXGNMTXCUAEGQQEUMCUAAXGXUSPJCXMPTGQA GCJSJUPSYGLXUYAUWCGLUQQMCNMTXCCGQQXGLAJNGCXMPTEJLCXXGULMP TWJLAJNGNMPDCGAMCYDWWGSUEUBEMCXJDCAYGUFMPTKDCUCQUACMCDPWJ QSGSMCAULNACJJFCXGXJJFUXJDCJWMCANJDCXUTUMPUPSAUMSAJBJDCXM PFBJDLGZXUPTGSSJBJDMNUWLUMSMUNAMLAUMSUQMZGMZUPCLGNGNKGLCX MPTAUAMDAGSUPSMSJPCFGGYCXGAUNGAMIGWJLCGPNMPDCGACJTGCXGLZU PCLGNGNKGLEXUCCXMPTAAUMSCXGZUCGLYMQQULEGQQMHGCLMGSCJAUBXJ ESJCXCXGQMCCQGKDABKGGKDCMCUQQZUNGSMWWGLGPCUQMZGLGYQMGSMPU HGLBNGQUPZXJQBHJMZGL