def zs(num):
    if num < 2:
        return False
    for i in range(2, num):
        if num % i == 0:
            return False
    return True

start = int(input("请输入范围的起始值："))
end = int(input("请输入范围的结束值："))

found = False
for num in range(start, end + 1):
    if zs(num):
        print("找到了一个质数：", num)
        found = True

if not found:
    print("在{}~{}内没有找到质数".format(start,end))