def sample(chr):
L=len(chr)
pos=int(random.uniform(0,L-100000))
while(pos<L-3):
codon=chr[pos:pos+3]
if(codon=="ATG"): break
pos+=3
if(codon!="ATG"): return -1
codons=0
while(pos<L-3):
codon=chr[pos:pos+3]
if(codon[0]=='N' or codon[1]=='N' or codon[2]=='N'): return -1
if(stops.get(codon,False)): break
codons+=1
pos+=3
return codons
#============================ main() ==============================
reader=FastaReader(filename)
while(True):
[defline,seq]=reader.nextSequence()
if(not defline): break
for i in range(NUM_ORFS):
length=sample(seq)
if(length<0): continue
print(length,flush=True)
reader.close()
