Need help with Q 4 only (Python yes required please explain so i can also learn from it )

Please help

Thank you..

Below picture is the Answer of Q-3 (needed to get answer for Q-4)

Key length is 8

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z RKALPOAJJRXUDEWBIKGZFWTNMXNNZQUTJRIYWTNOMEMOASQNLRTXDLVYIPKMMJEVCFLUOXQMEKOIYNZDIUUOE TVVWYXCWWJPXUOMETVXXMUCNPPZOZTUSOMBYCZBPZBCIIYLPAMVXV JNSPAVQVCICOANIMKLLWBDQVYVFEBCIE OEYPEISKCBLEBC PSYLY BDPREUwWBCHJCBTWMVWKNYCP IYI ISUJMMGMVBY TYOMI RZOYPINMEKMDLEG EMNSDB MYXMFTYOOSXKNWZWNIZNUOEPZJFXNFYMOSSXYLVBCIJZLTYONEEJQCPVXLFANESMKIXYNSLBAEJZYYPLHCCKZ ELZHXFZBPRZ JYEJZZCUTPZLNTYODXLVNZXGAETKCOTAXSMKLPOBCIDKNSZLNXYKSSLLOEBKHEZJDRUSYLYLVX KNYDLUZXZSYHTBCEMOIWPVOTLRFHSQXLXGPPXMZBTKMDTDZTRO LJAESSSLQMSEZBPWMAXJOXPDWOLRZCHLAEYJZUMWMOSKALYXGCIRJUMZCOXNUCYNPZW 5 5 HTLTDXKRYWZWN I EKKESMNXI OHRD BCEK ZCPO 3. Let L be the guess for the key length found in the previous problem. Read 2.3.3 and construct a frequency table for the 1st, (L +1)st, (2L +1)st,... letters. 4. The most common letters in the English language in order) are "etaoinshr. When a shift is applied, these appear in the following order 0a-etaoinshr 1b-fubpjotis 2-c-gvcqkpujt 3-dhwdrlqvku 13rgnbvafue 14shocbgvf 15tipdxchug 16--q-ujeydixh 17rvkrfzejyi 18lsgafkzj 19 - xnthbglak 20ynuichmbl 1 zovjdincrn 6g kzguotynx 7--h-- lahvpuzoy 9jncjxrvbqa 10 odkysxcrb 111-pelztydsc 12-fmauzetd 23x-bqxlfkpeo 24ycrymglqfp Use this table and the answer to the previous question to guess the fist character of the key used to generate the ciphertext. OUYGULYTKKUKKKHNCQPOKXGKUVOISJKEJ OMJNUOUYKOKKGXJGUYTVKTURKEJKHZYEK KKOKSRTLIOEUKGZCOYJGOKGKZKZJNGKGS OKENTPLMZNGS Occurences: [0,0,2,0,5,0,10,2,2,7,24,3,2,5,0,2,0,2,4,5,9,2,0,2,6