n=0 
 s='321' 
 for a in s: 
     for b in s: 
         for o in s[:2]: 
             for d in s[:2]: 
                 for e in s[:2]: 
                     for i in s[:2]: 
                         if (a+b+o+d+e+i).count('1')<=2: 
                             n+=1 
                             print (n, a+b+o+d+e+i) 
  

 
 n=0 
 s='123' 
 for a in s: 
     for b in s: 
         for o in '23': 
             for d in '23': 
                 for e in '23': 
                     for i in '23': 
                         if (a+b+o+d+e+i).count('1')<=2: 
                             n+=1 
                             print (n, a+b+o+d+e+i) 
 

 s = '321' 
 print(s[:2]) #32 
  
 s='123' 
 print(s[:0]) #пустая строка 
 print(s[1:]) #23