# 输出指定范围内的素数

# take input from the user

lower = int(input("输入区间最小值: "))

upper = int(input("输入区间最大值: "))

for num in range(lower,upper + 1):

# 素数大于 1

    if num > 1:

        for i in range(2, num):

            if (num % i) == 0:

                break

        else:

            print(num)