By Gina Kalovyrna and Ingrid Melander ATHENS (Reuters) - In a traditional cafe in a working-class neighbourhood of Athens, 55-year-old musician Stelios Maragakis said he has the solution to Greece's debt crisis: ditch the euro. "We must return to the drachma. The only way to save Greece is the drachma," he said, sipping from a small glass of spirit, Greek music sounding in the background.