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    SER A     
    ARG A    
...
    PRO A    
    LYS A    
    ARG A

ATOM      2  CA  PRO A   6       2.437   5.295 -23.029  1.00  0.00    
+       C  
ATOM      3  C    PRO A   6       2.307   5.113 -21.515  1.00  0.00   
+        C  
...
ATOM     15  N  TRP A   7       1.114   5.225 -20.998  1.00  0.00     
+      N  
ATOM     16  CA  TRP A   7       0.916   5.054 -19.531  1.00  0.00    
+       C  
ATOM     17  C   TRP A   7       0.772   3.567 -19.197  1.00  0.00    
+       C  <>

sub parse_pdb() {
    
...
    }
    return \%hash_pdb;
}