AOJ 1101 A Simple Offline Text Editor

Solved Users (link to submissions)
alei
ameolp
arsenic28
atetubou
aug
bal4u
blue_jam
choro3
cima
clear
CruelTurtle
cup_of_tea
c_plus_c
d17202
Darsein
dolphin3
draftcode
dream132
dr_ken
ee17029
ee67052
flowlight
fujixx
fura2
hadrori
haru_td
hatoo
hiron
holeguma
hrkksym
hs484
Huziwara
ichirin
ichyo
ikatakos
inmu114514
ir5
ishikado
issysan
iY9g
japlj
kaya
Kazami
kmatsunaga
kmcyuma
kuzukuzu
kyuridenamida
k_hanazuki
k_operafan
logicmachine
lrmystp
lyoz
mamekin
masquerade0324
math
mikeCAT
MISB77
mkut
mondatto
moon_watcher
namonakiaccount
naoya_t
ne200031
ne210064
nisshy
nokopro
not
oblivion
ochaochaocha3
odashi
okaoka
orpheus
osa_k
PItS
pldw
pollyanna
puyopop
rabelice
rankalee
remin
Respect2D
rk19891025
roiti
runner3494
rutto
ryoga
s1140014
s1160219
s1180007
s1180133
s1190048
sarasouju
sh19910711
shimasuzu
shimomire
shioshiota
snsk
sumino
sune2
SuzuTaku_ph
Tan
tangent_theta
teamMoriMori
tkmhsy
tnakao
tohhy
tomoya
tozangezan
uchan
uhtomo
uncode
ustimaw
weighted_majority
wiw
XKITANOHYDE
yohta
yokit9
yoshnary
yt_siden
yuki
yuta1024
yutaka
YuukiARIA
zeptometer
zhanghanfeng
zukky