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  1. or download this
    #!usr/bin/perl-w
$a="ATCGGCGCCTAT";
code??
...
 Letters at 3rd position:\n
  A3=$A3; T3=$T3; G3=$G3; C3=$C3; \n";
exit;
  2. or download this
    The result of counting from the string should look like:
 Letters at 1st position:
   A1=1; T1=1; G1=2; C1=0; 
...
   A2=1; T2=1; G2=1; C2=1; 
 Letters at 3rd position:
   A3=0; T3=1; G3=0; C3=3;