How can I make that code count characters only -- HELP

I want to make the first code count only letters, how can I do that?

#----------give the number of the characters
len = info.length
len1 = len
@info = info + “” + $myinfo
len = @info.length(&:length)
len2 = len - 1
len3 = len2 - len1
@words = len3.to_i“wiki.txt”,“r”)
file00.each do |line|
info=info + line

$myinfo = info
@info = $myinfo

And this below should count only words, but it count ("."!"@"?";"
etc… symbols too) symbols and space.
#------------------------------gives the number of words 2 options“wiki.txt”,“r”)

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