letter: a popped: z list: abcdefghijklmnopqrstuvwxy
letter: b popped: y list: abcdefghijklmnopqrstuvwx
letter: c popped: x list: abcdefghijklmnopqrstuvw
letter: d popped: w list: abcdefghijklmnopqrstuv
letter: e popped: v list: abcdefghijklmnopqrstu
letter: f popped: u list: abcdefghijklmnopqrst
letter: g popped: t list: abcdefghijklmnopqrs
letter: h popped: s list: abcdefghijklmnopqr
letter: i popped: r list: abcdefghijklmnopq
letter: j popped: q list: abcdefghijklmnop
letter: k popped: p list: abcdefghijklmno
letter: l popped: o list: abcdefghijklmn
letter: m popped: n list: abcdefghijklm