Here the letters are coded according to their place values in the English alphabetical series.
D=4, I=9, R=18=(1+8)=9, E=5, C=3, T=20=(2+0)=2, O=15=(1+5)=6, R=18=(1+8)=9
Similarly,
F=6, R=18=(1+8)=9, I=9, E=5, N=14=(1+4)=5, D=4, L=12(1+2)=3, Y=25=(2+5)=7
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