def get_statistics(s)
a=[0,0,0,0]
an=/[a-zA-Z0-9]/
ws=/[ \t\n]/
s.each_byte{|x|
s=x.chr
a[an=~s ?2:ws=~s ?1: x<127&&x>32?3:0]+=1
}
a
end
STDIN.each do |line|
st = get_statistics(line)
st = [st[0], st[2], st[3]]
puts st.map{|x|"#{x}B"}*' / '
end
Note that non-ascii characters in the above source code will be escaped (such as \x9f).