If Gengar becomes 75145118, what does Gastly become?

7119201225

Explanation:

According to the question, Gengar becomes 75145118, means it is consdering A as 1, B as 2, C as 3 ... and Z as 26, and when a character repaets it does minus 2 like in the question G=7, E=5, N=14, again G which should be 7 but as its a repeated character we are doing - 2 here i. e 5, and next character is A=1, R=18,

Similarly Gastly will be 7119201225