on rightclick:
    block is a sign
    line 2 of clicked block is "&4checkpoint"
    line 3 of clicked block is "&e[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!"