solo $20$

$4$ppoir tur wie sorech

Thereadie shack $9$

cresede queue $0$

hritule $98($we $-941$

$30$

Sxititis $)=\{2$

$4S$

frit switch statement?

Conee lo IS $($S$.$ iskmpty to trie$)$

$(y=$ s$.$topt$)$

Teintout $("$Stabk $8$lement: if $1y)$;

s$.$ pop $1$