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def f(s,r='',l=-3): for c in s+'\0': if c.isalpha():l+=1 else:r+=('Bl%st'%('e'*l))[:l+3*(l>=0)]+c;l=-3 returnprint r
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def f(s,r='',l=-3): for c in s+'\0': if c.isalpha():l+=1 else:r+=('Bl%st'%('e'*l))[:l+3*(l>=0)]+c;l=-3 return r
Try it online!
def f(s,r='',l=-3): for c in s+'\0': if c.isalpha():l+=1 else:r+=('Bl%st'%('e'*l))[:l+3*(l>=0)]+c;l=-3 print r
def f(s,r='',l=-3): for c in s+'\0': if c.isalpha():l+=1 else:r+=('Bl%st'%('e'*l),'Blt'[)[:l]l+3*(l>=0)[l<0]+c;l=]+c;l=-3 return r
def f(s,r='',l=-3): for c in s+'\0': if c.isalpha():l+=1 else:r+=('Bl%st'%('e'*l),'Blt'[:l])[l<0]+c;l=-3 return r
def f(s): r,l=''r='',0l=-3): for c in s+'\0': if c.isalpha():l+=1 else:r+=('Bl'+'e'*'Bl%st'%(l-3'e'*l)+'t','Blt'[:l])[l<3]+c;l=0[l<0]+c;l=-3 return r
def f(s): r,l='',0 for c in s+'\0': if c.isalpha():l+=1 else:r+=('Bl'+'e'*(l-3)+'t','Blt'[:l])[l<3]+c;l=0 return r
