This is a number code translator, where the following '1234567890' means 'ABCDEFGHIJ'. Because of that, the letters A-J only would translate to numbers. To translate, it would work like this:
'Hello' was translated to '85LLO' because A-J are the only functioned letters. To do this, H is the 8th letter in the alphabet and E is the 5th letter in the alphabet, so it was translated to that.
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