""" 
CSDN : heart_6662
PYTHON amateur   
"""
lower = int(input("请输入区间最小值："))
upper = int(input("请输入区间最大值："))

for num in range(lower,upper+1):
    if num > 1:
        for i in range(2,num):
            if (num % i) == 0:
                break
        else:
            print(num)