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Lang's teacher gave a piece of paper to Lang and said to him, "Three good quotes are written here. But you have to achieve them through some difficulties". The following was written in the paper:
(a) CAJEQO EO KJA LANYAJP EJOLENWPEKJ WJZ JEJAPU-JEJA LANYAJP LANOLENWPEKJ.
(b) ZIQQHUV QHYHU TXLW DQG TXLWWHUV QHYHU ZLQ.
(c) NRFLNSFYNTS NX RTWJ NRUTWYFSY YMFS PSTBQJILJ.
Can you find the quotes?

Note: The problem is taken from the book Neurone Onuronon by Muhammad Zafar Iqbal. I don't have any solution to the problem. Thinking mathematically might help as the book is on mathematical puzzles.

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The solution is basically a

shift cipher, where the value to shift is different for each line.

Using ROT4 on (a), you get "GENIUS IS ONE PERCENT INSPIRATION AND NINETY-NINE PERCENT PERSPIRATION."

Using ROT23 on (b), you get "WFNNERS NEVER QUIT AND QUITTERS NEVER WIN." (probably an error as I think it should be WINNERS.)

Using ROT21 on (c), you get "IMAGINATION IS MORE IMPORTANT THAN KNOWLEDGE."

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