if __name__ == '__main__':
    a = 4
    b = 5
	
    print('a + b')
    print(a + b)
	
    print('a - b')
    print(a - b)
	
    print('a * b')
    print(a * b)
	
    print('a / b')
    print(a / b)
	
    print('a mod b')
    print(a % b)