Where are the other nine?

Here’s a good story about giving thanks.

[Jesus Cleanses Ten Lepers]
    On the way to Jerusalem he was passing along between Samaria and Galilee. And as he entered a village, he was met by ten lepers, who stood at a distance and lifted up their voices, saying, “Jesus, Master, have mercy on us.” When he saw them he said to them, “Go and show yourselves to the priests.” And as they went they were cleansed. Then one of them, when he saw that he was healed, turned back, praising God with a loud voice; and he fell on his face at Jesus' feet, giving him thanks. Now he was a Samaritan. Then Jesus answered, “Were not ten cleansed? Where are the nine? Was no one found to return and give praise to God except this foreigner?” And he said to him, “Rise and go your way; your faith has made you well.”
(Luke 17:11-19 ESV)

Interpretive Note: This story would have been shocking to Jews in the 1st century because Samaritans were shunned by the Jews as infidels. Just imagine a group that "everybody" looks down on and avoids, and you get the idea of what a Samaritan was to the Jews.