def last$\_$to$\_$first$($bwt$)$:

# Construct first column of the Burrows$-$Wheeler Matrix

first$\_$column $=$ sorted$($bwt$)$

# Create a dictionary to store counts of characters

count $=\{\}$

for char in first$\_$column:

if char not in count:

count$[$char$]=0$

count$[$char$]+=1$

# Initialize L$2$F array

l$2$f$\_$array $=[0]*$ len$($bwt$)$

# Iterate through sorted first column to assign L$2$F values

for i in range$($len$($bwt$))$:

char $=$ bwt$[$i$]$

rank $=$ count$[$char$]$ # Rank of the character in the sorted first column

count$[$char$]-=1$ # Decrease count for the character

l$2$f$\_$array$[$i$]=$ rank

return l$2$f$\_$array

# Given BWT

bwt $=$ "smnpbnnaaaaaa"

# Generate L$2$F array

l$2$f$\_$array $=$ last$\_$to$\_$first$($bwt$)$

# Order L$2$F array

ordered$\_$l$2$f$\_$array $=$ sorted$($enumerate$($l$2$f$\_$array$),$ key$=$lambda x: x$[1])$

# Extract values of the L$2$F array

values$\_$l$2$f$\_$array $=[$index for index, value in ordered$\_$l$2$f$\_$array$]$

# Print the ordered L$2$F array

print$("$Values of the L$2$F array $($ordered from top to bottom$)$:$",$ values$\_$l$2$f$\_$array$)$