“Extra Omnes!”
Outside, all [of you]!
It might be in Latin. It might be formal. It might be ceremonial. But the Master of Papal Liturgical Ceremonies means what he says.
Everybody git out!
Everyone who is not permitted to be in the Conclave for the election of the new Pope must leave the Sisteen Chapel, and the doors are locked until a Pope is elected.
Prayer for the Election of a Pope
O God, eternal shepherd, who govern your flock with unfailing care, grant in your boundless fatherly love a pastor for your Church who will please you by his holiness and to us show watchful care. Through our Lord Jesus Christ, your Son, who lives and reigns with you in the unity of the Holy Spirit, one God, for ever and ever. Amen.
With Open Doors 
Love the prayer and the picture. I borrowed it for the Prayer Chain.
Chris