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We iterate through each element in the loop and try to convert it to an integer. If successful - assign it to the element, if not - report (or not) and move to the next element.

a = [""1"", ""2"", ""hello"", ""3"", ""hello""]for index in range(len(a)):    try:        a[index] = int(a[index])    except ValueError:        print(""not a number"") # or whatever, pass for exampleprint