$c=\text{'}y\text{'}$

while $c==\text{'}y\text{'}$ :

# Do something

print$(\text{'}$Enter $y.$ to continue, $n$ to quit: $\text{'},$ end$=\text{'}\text{'})$

$c=$ input$()$

print$(\text{'}$Done$\text{'})$

Which input for variable c causes "Done" to be output next?

$\text{'}y\text{'}$ only

$\text{'}n\text{'}$ only

Any value other than $\text{'}y\text{'}$

No such value $($infinite loop$)$