This program uses the lettering system used in spreadsheet columns to encrypt text.
A, B, C, D, E, ... AA, AB, AC, ... DAF, DAG, DAH, ... SHMIRGANFLOIB, SHMIRGANFLOIC, SHMIRGANFLOID etc.
A, B, C, D, E, ... AA, AB, AC, ... DAF, DAG, DAH, ... SHMIRGANFLOIB, SHMIRGANFLOIC, SHMIRGANFLOID etc.