Printer and non-transitory computer-readable recording medium storing computer-readable instructions for printer

A printer includes: a print executing unit configured to execute printing on a sheet paper; a process executing unit configured to execute a predetermined process related to cutting of the sheet paper; and a controller. The controller is configured to, in a case where a first sheet paper having a first size is contained, send capability information to a terminal device, wherein the capability information includes specific size information indicating a sheet paper having a specific size. The specific size information includes a specific character string. The controller is configured to receive selection information indicating that the specific size was selected from the terminal device in response to a user selecting the specific character string. The controller is configured to, in a case where the selection information is received from the terminal device, cause the process executing unit to execute the predetermined process on the first sheet paper.