| Behavior - Plain English | Input | Output |
|---|---|---|
| Every letter 'E' will be replaced with '3' | Help | H3lp |
| Every letter 'O' will be replaced with '0' | Dog | D0g |
| Every letter 'I' will be replaced with '1' | Inn | 1nn |
| Every letter 'i' will not be replaced | I dig | 1 dig |
| Every letter 's' will be replaced with 'z' | As | Az |
| Every word that starts with 's' will not be replaced | As Sam | Az Sam |