Write a program which reads two integers a, b and an operator op, and then prints the value of a op b.  The operator op is '+', '-', '*' or '/' (sum, difference, product or quotient). The division should truncate any fractional part.
op = ""
while op != "?":
    a, op, b = input().split()
    a = int(a)
    b = int(b)
    if op == "+":
        print(a + b)
    elif op == "-":
        print(a - b)
    elif op == "*":
        print(a * b)
    elif op == "/":
        print(a / b)
    elif op == "?":
        break
a, op, b = input().split()
a = int(a)
b = int(b)
while op != "?":
    if op == "+":
        print(a + b)
    elif op == "-":
        print(a - b)
    elif op == "*":
        print(a * b)
    elif op == "/":
        print(a // b)
    a, op, b = input().split()
    a = int(a)
    b = int(b)
    