Valentine Demand

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Chef is very happy today as he is taking his favorite string S as a gift for his valentine. But as soon as Chef starts wrapping his gift, he receives a message from his valentine. In the message, she demanded of only those strings which consist of N digits of her choice. Now to fulfill her demand, Chef needs to change his favorite string but he also wants to maintain the beauty of the string, so,

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solution.cppC++17

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