Generate group sequence number

Hi Experts,

Could you please help for this scenario.

Input:

id | Name
---|-------
abc|India
abc|America
abc|China
bcd|Brazil
bcd|Japan

Output:

GrpKey|id | Name
-----|---|---
1     |abc|India
1     |abc|America
1     |abc|China
2     |bcd|Brazil
2     |bcd|Japan

I want to generate group keys like above. Please help

MUS