def main():
    print('==Exercise 1==')
    flag=True
    while flag:
        a = input("pls input number A:")
        try: 
            a = int(a)
            flag=False
        except :
            print("pls input a number!")
    flag=True
    while flag:
        b = input("pls input number B:")
        try: 
            b = int(b)
            flag=False
        except :
            print("pls input a number!")

    print(f"The result for A+B={a+b}")

    print('==End Of Ex1==')
    return 0

if __name__ == '__main__':
    main()