#!/usr/bin/env python

import random
import sys

#function that simulates the sequence
def simulate_sequence(length):
    #list with the nucleotides
    dna = ['A', 'C', 'G', 'T']
    #emtpy string to receive simulated sequence
    sequence = ''
    for i in range(length):
        #random.choice() picks a random element of 
        sequence += random.choice(dna)
    return sequence

#get three values from the arguments
setsize = int(sys.argv[1])      #number of sequences to simulate
minlength = int(sys.argv[2])    #minumum sequence length
maxlength = int(sys.argv[3])    #maximum sequence length

#assign an empty list
sequenceset = []
for i in range(setsize):
    #generate a random number that determines the sequence length
    rlength = random.randint(minlength, maxlength)
    #calls the function that simulates the sequence
    sequenceset.append(simulate_sequence(rlength))

#print result
for sequence in sequenceset:
    print sequence