Max 69 number, hail mlsc

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Its no secret that we at MLSC love the **number** 69, (unclear about the other one)\ Given a number consisting of only 6s and 9s, print the largest number you can get by changing at most one digit.\ (Convert one 6 to 9 or vice verse) ### Input - The first line of input will contain a single integer $T$, denoting the number of test cases. - Each line contains the number with 6s and 9s ### Output

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solution.cppC++17

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