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I'm writing a python programme that calculates operations like + - * in roman numerals. The programme takes to 2 inputs from the user which

I'm writing a python programme that calculates operations like + - * in roman numerals. The programme takes to 2 inputs from the user which are both roman numerals but I am struggling to implement an error check to ensure that there can only be a string input. If the user enters an integer i'd like it to display an error message and loop back to the input

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