Writing whole alphabet in Vim -

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i need write whole alphabet abcd…z , hate typing letter letter in vim's insert mode. there exist method more efficiently?

i know ga command gives me ascii code of character cursor … don't know how mix standard solution type numbers 1 (for example) 5000: a1escqqyyp^aq4998@q …

using set nrformats+=alpha:

ia<esc>qqylp<c-a>q24@q

step step:

ia<esc>      " start 'a' qqylp<c-a>q  " @q duplicate last character , increment 24@q         " append c..z

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