26(15) РТ

f = open(r'C:\Users\SnowDrit\Downloads\26(1)\26.15.txt')  # на 2 балла
n = int(f.readline())
biletiki = []
for s in f:
    ryad,mesto = map(int,s.split())
    biletiki.append([ryad,mesto])
biletiki.sort()
for i in range(1,len(biletiki)):
    if biletiki[i][0] == biletiki[i-1][0] and biletiki[i][1] - biletiki[i-1][1] == 18:
        print(biletiki[i][0],biletiki[i-1][1] + 1)