try:
    from decimal import Decimal
except:
    Decimal = float

def calculation(a,b):
    try:
        a,b = Decimal(a),Decimal(b)
    except:
        raise ValueError("Given number is not even a decimal!")
    
    aa,s = a+b,a-b
    print(f"{a}+{b}={aa},{a}-{b}={s}")
    return aa,s
    

def main():
    print('==Exercise 3==')
    
    a,s = calculation(114,514)
    print(f"Return Value: {a},{s}")
    
    print('==End Of Ex3==')
    return 0

if __name__ == '__main__':
    main()