Identification

Then there were two sardars, Zail singh & Jarnail singh. Both of them bought a horse each. "How will we know which is your & which is mine?" asked Zail. "Easy"replied Jarnail. "I'll cut mine's tail,yours will be the one with tail" This was heard by a few boys ,they cut the other's tail too. Next morning the confusion continued. "Don't worry "retorted Jarnail. "I'll tie a bell around its neck, yours will be the one without the bell." The boys heard this also & cut the bell. The next day, Zail got frustrated & said "Okay now the last criterion, white will be yours & black will be mine."