Check and split string with while loop in sql

// Query

declare @strQ varchar(20)='0001010100',@cnt int=1,@strRe varchar(10)=''

while (@cnt<=13)

begin

if(SUBSTRING(@strQ,@cnt,1)=1)

begin

set @strRe=@strRe+cast(@cnt as varchar)+',';

end

set @cnt=@cnt+1;

end

print @strRe

// Result