Insert commas in the following numbers in International and Indian Number System?

[a] 912345678
[b] 876543219
[c] 219354768

S.No                    International Number System                    Indian Number System

[a]                                  912,345,678                                             91,23,45,678

[b]                                   876,543,219                                            87,65,43,219

[c]                                   219,354,768                                             87,64,53,912