因为现在我们在学python，假如下面这个
salary = int(input("Enter your annual salary"))
year = int(input("Enter years on the jobs"))
if salary >= 30000:
if year >= 2:
print("You qualify for the loan")
else:
print("you must be on current job for at least 2 years to qualify")
else:
print("you must earn at least 30000 to qulify")
怎么写可以说只可以让她输入数字，如果她输入的不是数字就错误？求大神指导

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