#more file input/output examples
#removing chars from string examples

def main():
	#open file for reading 
	dna_input_file=open('input.txt', 'r')
	dna=dna_input_file.read()
	dna_output_file=open('output.txt', 'w')

	dna_output_file.write("original input\n")
	dna_output_file.write(dna)
	no_space_dna=""
	for i in range(len(dna)):
		if (dna[i]!=' '):
			no_space_dna+=dna[i]
	dna_output_file.write("no spaces dna\n")
	dna_output_file.write(no_space_dna)
	#removes new lines at the end
	almost_clean_dna = no_space_dna.rstrip()
	dna_output_file.write("almost clean dna\n")
	dna_output_file.write(almost_clean_dna)
	dna_output_file.write("\nend of file line\n")
	
	dna_output_file.write("loop printing in file\n")
	for i in range(len(almost_clean_dna)):
		dna_output_file.write(almost_clean_dna[i]+'\n')
	

main()