I can’t say the question is very clear, but if the question is just the title then the answer is simple:
26^6
or in python syntax 26**6
If you want a print statement it would be print(26**6)
More generally: The amount of combinations for X characters where any character has N combinations is N^X
Do note that this is only true when using exactly that amount of characters in every combination
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solved How many password combinations are possible with 6 lower case letters in Python