Advent of code - Day 4 - First task

counter = 0

with open("text.txt", "r") as input_data:
    for line in input_data:
        line = line.strip("\n")
        first_pair, second_pair = line.split(",")
        first_num1, second_num1 = first_pair.split("-")
        first_num2, second_num2 = second_pair.split("-")
        first_range = set([i for i in range(int(first_num1), int(second_num1) + 1)])
        second_range = set([i for i in range(int(first_num2), int(second_num2) + 1)])
        if first_range.issubset(second_range) or second_range.issubset(first_range):
            counter += 1

print(counter)