data_file = open("hw3.birds.1.txt", 'rU')
out1 = open("hw3.birds.2.txt", 'w')

for idx, row in enumerate(data_file):
	cols = row.replace('\n', '').split('\t')

#Time	Height	Unique ID
#13:39	L	1
	if idx>0:
		time=cols[0]
		state=cols[1]
		bird=cols[2]

		if idx==1:
			current_bird=cols[2]
			current_state=cols[1]
			start_time= 60*int(time.split(":")[0]) + int(time.split(":")[1])
			start_hour=int(time.split(":")[0])

		if bird != current_bird or state != current_state: # Report change
			present_time = 60*int(time.split(":")[0]) + int(time.split(":")[1])
			present_hour = int(time.split(":")[0]) # must account for circularity of time
			if bird == current_bird:
				if present_hour>=start_hour:
					out1.write(current_bird+"\t"+current_state+"\t"+str(present_time-start_time)+"\n")
				else: # clock struct midnight or high noon
					interval = (60*24-start_time)+present_time
					out1.write(current_bird+"\t"+current_state+"\t"+str(interval)+"\n")	 
			current_bird=bird
			current_state=state
			start_time=present_time
			start_hour=present_hour