Step 1: Divide the number into separate digits:
94044 => 9 4 0 4 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 4 => 5
4 to 0 => 4
0 to 4 => 4
4 to 4 => 0
4 to 9 => 5
Step 3: Convert distances to codes (0=E[qual],
1 & 9 = C[onsecutive], 2-8 = N[one]):
5 => N
4 => N
4 => N
0 => E
5 => N
Step 4: Combine the filters to a string:
N N N E N = NNNEN