I have this coding problem but my answer is incorrect. Can you please explain why my code is wrong and how I can fix it$?$

# variables:

x $=3$

y $=5$

z $=[1,2,6]$

def a$($b$,$ c$,$ d$)$:

Mod $=(10**9+7)$

e $=[0]*$ c

e$[0]=1$

for f in d:

new$\_$e $=$ e$[$:$]$

for g in range$($c$)$:

new$\_$g $=($g $+$ f$)\%$ c

new$\_$e$[$new$\_$g$]+=$ e$[$g$]$

e $=$ new$\_$e

h $=$ e$[0]\%$ Mod

return h

result $=$ a$($x$,$ y$,$ z$)$

print$($result$)$