$ ./program 2000-12-30 2000-12-31 Protein
1DQ7
1F8I
1F8M

$ ./program 2014-07-24 2014-07-31 RNA
4PMW
4PY5
4U1U
4U1V
4U20
4U24
4U25
4U26
4U27
4UJC
4UJD