on rightclick:
    block is a sign
    line 2 of clicked block is "checkpoint"
    line 3 of clicked block is "[rightclick]"
    player is on ground
    set {checkpoint.%player1%} to location of player
    message "&6チェックポイントを設定しました!"
 if player has permission "skript.admin":
     message "&7Location of player not jump"

on leftclick with fire charge:
 cancel event
 if clicked block is sign:
     stop
 if {checkpoint.%player1%} is set:
     teleport player to {checkpoint.%player1%}
 else:
     message "&cチェックポイントが設定されていません!"