26 пересечение отрезков (событий)

#https://postimg.cc/QF0kY2vL
data = open('26.txt').readlines()
n = int(data[0])
a = []
for e in data[1:]:
    l, r = map(int, e.split())
    a.append((l, r))
a.sort(key=lambda x: x[1])
answ = [a[0]]
for i in range(1, n):
    if answ[-1][1] <= a[i][0] and a[i][0] - answ[-1][1] >= 15:
        answ.append(a[i])
print(len(answ))
print(*answ, sep='\n')