Step 1: Divide the number into separate digits:
5832 => 5 8 3 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 8 => 3
8 to 3 => 5
3 to 2 => 1
2 to 5 => 3
Step 3: Convert distances to codes (0=E[qual],
1 & 9 = C[onsecutive], 2-8 = N[one]):
3 => N
5 => N
1 => C
3 => N
Step 4: Combine the filters to a string:
N N C N = NNCN