babbage% cat character.file
&ABCDEFGHIJKLMNOPQRSTUVWXYZ
A&BCDEFGHIJKLMNOPQRSTUVWXY
AB&CDEFGHIJKLMNOPQRSTUVWX
ABC&DEFGHIJKLMNOPQRSTUVW
ABCD&EFGHIJKLMNOPQRSTUV
ABCDE&FGHIJKLMNOPQRSTU
ABCDEF;GHIJKLMNOPQRST
ABCDEFG;HIJKLMNOPQRS
ABCDEFGH;IJKLMNOPQR
ABCDEFGHI;JKLMNOPQ
ABCDEFGHIJ-KLMNOP
ABCDEFGHIJK-LMNO
ABCDEFGHIJKL-MN
ABCDEFGHIJKLM-
ABCDEFGHIJKL
ABCDEFGHIJK
ABCDEFGHIJ
ABCDEFGHI
ABCDEFGH
ABCDEFG
ABCDEF
ABCDE
ABCD
ABC
AB
A
?
&abcdefghijklmnopqrstuvwxyz
a&bcdefghijklmnopqrstuvwxy
ab&cdefghijklmnopqrstuvwx
abc&defghijklmnopqrstuvw
abcd&efghijklmnopqrstuv
abcde&fghijklmnopqrstu
abcdef;ghijklmnopqrst
abcdefg;hijklmnopqrs
abcdefgh;ijklmnopqr
abcdefghi;jklmnopq
abcdefghij-klmnop
abcdefghijk-lmno
abcdefghijkl-mn
abcdefghijklm-
abcdefghijkl
abcdefghijk?
babbage% gcc -o fileletters-1 fileletters-1.c && fileletters-1 
This program counts letter frequencies in a file
Enter file name: character.file
Frequency counts of letters in character.file.

  a  b  c  d  e  f  g  h  i  j  k  l  m  n  o  p  q  r  s  t  u  v  w  x  y  z
 42 41 40 39 38 37 36 35 34 33 32 30 28 26 24 22 20 18 16 14 12 10  8  6  4  2
Non-letters:  30
Control characters:  43