Lists at$\_$bus$\_$stop and on$\_$board$\_$bus are read from input, representing passengers waiting to board a bus and passengers on the bus, respectively. Perform the following tasks:

$-$ Remove the first element from on$\_$board$\_$bus and output 'Passenger alighted: $\text{'}$ followed by the element.

$-$ Add all the remaining elements of at$\_$bus$\_$stop to the end of on$\_$board$\_$bus.

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Note: All passenger names are unique.

$```$

at$\_$bus$\_$stop $=$ input$().$split$()$

on$\_$board$\_$bus $=$ input$().$split$()$

print$($f$\text{'}$Passengers waiting at a bus stop: $\{$at$\_$bus$\_$stop$\}\text{'})$

print$($f$\text{'}$Passengers on board: $\{$on$\_$board$\_$bus$\}\text{'})$

print$($f$\text{'}$Updated passengers on board: $\{$on$\_$board$\_$bus$\}\text{'})$

$```$