أعوذ بالله من الشيطان الرجيم

بِسْمِ ٱللَّٰهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ

As Salaamu Alaikum Wa Rahmatullahi Wa Barakatuh,

Based on your specific question and information provided.

From the Jurisprudence Perspective:
If you do not possess anything on which it is lawful to perform prostration, you should perform prostration on your dress / clothes and if even this is not possible you should perform prostration on the back of your hand.

والله العالم‎
(and Allah(awj) Knows best)

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