#!/opt/local/bin/python
import sys

seqsPerFile = int(sys.argv[1])
filename = sys.argv[2]
if len(sys.argv) > 3 :
	stubfilename = sys.argv[3]
else :
	stubfilename = filename

print seqsPerFile
print filename

file = open(filename, 'r')
data = file.readlines()

index = 0
fileindex = 0
whole = ""
for line in data:
	if line[0] == '>':
		index = index + 1
	#print index
	#print seqsPerFile
	#print index > seqsPerFile
	if index > seqsPerFile:
		newFileName = stubfilename +".part"+ str(fileindex)
		print newFileName
		newfile = open(newFileName, 'w')
		newfile.write(whole)
		newfile.close()
		whole = ""
		index = 1
		fileindex = fileindex + 1
	whole = whole + line

newFileName = stubfilename +".part"+ str(fileindex)
print newFileName
newfile = open(newFileName, 'w')
newfile.write(whole)
newfile.close()

file.close()