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use strict;
use warnings;
...
           : 0
           } sort keys %letters
}

               A       B       C       D       E       F
         1    0.60    0.20    0.20    0.00    0.00    0.00
...
         4    0.20    0.40    0.00    0.20    0.00    0.20
         5    0.00    0.40    0.00    0.20    0.40    0.00
         6    0.00    0.20    0.40    0.20    0.00    0.20