Remove comma between digits of a number (123,456; 345,789)

I am querying data and getting all the desired data  from DB.

And Ids are one of them.
Now I need to move these data from expression rule to process model after doing required changes in the rule.

These Ids are like {123456, 345789, 567890, 120078}.


I stored them in map like map(id: {123456, 345789, 567890,120078}).


But when I am trying to extract these Ids from the map using indexing  and use with a process varible, which is an integer type with multiple checked, to store data, it is storing like {123,456; 345,789; 567,890; 120,078}. 

Kindly help me to get my Ids as they are without these unnecessary commas

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