x = int(input())
y = int(input())
def cal(a,b):
    result = a - b
    return result
print(cal(x,y))
print(cal(y,x))
定义函数
def add_numbers(a, b):
    result = a + b
    return result

# 调用函数并接收返回值
sum_result = add_numbers(3, 4)
print(sum_result)  # 输出：7