Who invented letters?

Who invented letters?

Who invented A,B,C,D,E,..............Z  did a  great thing. But he kept U and I very very far.

But I still got a place where U and I are very close..... in fact
together.......

Do you know where U and I can be together.........

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It is on the keyboard.....  ^_^

Popat, don't see the keyboard now!!