question about Sanskrit in Indo-Greek coinage

[pc2]

salutations,

we found, in Wikipedia, an article talking about the Indo-Greek king Strato II (http://en.wikipedia.org/wiki/Strato_II).
in this article, there is an image of a coin, which, in the reverse, says: "MAHARAJASA TRATARASA STRATASA, POTRASA CASA PRIYAPITA STRATASA" ("King Strato the Saviour, and his grandson Strato Philopator (Father-loving)").
but, when we read this Sanskrit legend, we couldn't understand why the words are ending with "SA". we think that it should be:
"mahārājā trātā stratah pautraś ca prīyapitā stratah.".
so, why this "SA" in the end of the words?

thank you in advance,