Step 1: Divide the number into separate digits:
85332 => 8 5 3 3 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 5 => 3
5 to 3 => 2
3 to 3 => 0
3 to 2 => 1
2 to 8 => 6
Step 3: Convert distances to codes (0=E[qual],
1 & 9 = C[onsecutive], 2-8 = N[one]):
3 => N
2 => N
0 => E
1 => C
6 => N
Step 4: Combine the filters to a string:
N N E C N = NNECN