Buggy python submission (verdict: Runtime Error):
'''
ITP-1_4-C
 ?¨???????
???????????´??° a, b ??¨?????????????????? op ?????????????????§???a op b ????¨??????????????????°?????????????????????????????????
????????????????????? op ??????"+"(???)???"-"(???)???"*"(???)???"/"(???)???????????¨?????????????????§????????????????????´?????????
?°???°?????\??????????????¨????????????????¨????????????¨????????????
???Input
??\???????????°????????????????????????????§???????????????????????????????????????????????????¢????????\????????¨????????§??????
 a op b
op ??? '?' ?????¨??? ??\?????????????????????????????????????????±???????????????????????£????????????????????????
???Output
?????????????????????????????????????¨??????????????????????????????????????????????
'''
# import
import sys

# ?????°??????????????????
for inputData in sys.stdin:
    a, op, b = map(int,input().split())
#    a, b, op = int(inputData[0]), int(inputData[2]), inputData[1]
    retVal = 0

    # 0?????´??? ????????????
    if op == '?':
        # exec end
        break
    elif op == '+':
        retVal = int(a) + int(b)
    elif op == '-':
        retVint(a)l = int(a) - int(b)
    elif op == '*':
        retVal = int(a) * int(b)
    elif op == '/':
        retVal = int(a) / int(b)
    else:
        retVal = 0

    # ????????????
    print(retVal)

Fixed submission:
'''
ITP-1_4-C
 ?¨???????
???????????´??° a, b ??¨?????????????????? op ?????????????????§???a op b ????¨??????????????????°?????????????????????????????????
????????????????????? op ??????"+"(???)???"-"(???)???"*"(???)???"/"(???)???????????¨?????????????????§????????????????????´?????????
?°???°?????\??????????????¨????????????????¨????????????¨????????????
???Input
??\???????????°????????????????????????????§???????????????????????????????????????????????????¢????????\????????¨????????§??????
 a op b
op ??? '?' ?????¨??? ??\?????????????????????????????????????????±???????????????????????£????????????????????????
???Output
?????????????????????????????????????¨??????????????????????????????????????????????
'''
# import
import sys

# ?????°??????????????????
for inputData in sys.stdin:
    inputList = inputData.split()
    a, op, b = int(inputList[0]), inputList[1], int(inputList[2])
    retVal = 0

    # 0?????´??? ????????????
    if op == '?':
        # exec end
        break
    elif op == '+':
        retVal = a + b
    elif op == '-':
        retVal = a - b
    elif op == '*':
        retVal = a * b
    elif op == '/':
        retVal = a // b
    else:
        retVal = 0

    # ????????????
    print(retVal)

Buggy python submission (verdict: Runtime Error):
'''
ITP-1_4-C
 ?¨???????
???????????´??° a, b ??¨?????????????????? op ?????????????????§???a op b ????¨??????????????????°?????????????????????????????????
????????????????????? op ??????"+"(???)???"-"(???)???"*"(???)???"/"(???)???????????¨?????????????????§????????????????????´?????????
?°???°?????\??????????????¨????????????????¨????????????¨????????????
???Input
??\???????????°????????????????????????????§???????????????????????????????????????????????????¢????????\????????¨????????§??????
 a op b
op ??? '?' ?????¨??? ??\?????????????????????????????????????????±???????????????????????£????????????????????????
???Output
?????????????????????????????????????¨??????????????????????????????????????????????
'''
# import
import sys

# ?????°??????????????????
for inputData in sys.stdin:
    a, op, b = map(int,input().split())
    retVal = 0

    # 0?????´??? ????????????
    if op == '?':
        # exec end
        break
    elif op == '+':
        retVal = int(a) + int(b)
    elif op == '-':
        retVal = int(a) - int(b)
    elif op == '*':
        retVal = int(a) * int(b)
    elif op == '/':
        retVal = int(a) / int(b)
    else:
        retVal = 0

    # ????????????
    print(retVal)

Fixed submission:
'''
ITP-1_4-C
 ?¨???????
???????????´??° a, b ??¨?????????????????? op ?????????????????§???a op b ????¨??????????????????°?????????????????????????????????
????????????????????? op ??????"+"(???)???"-"(???)???"*"(???)???"/"(???)???????????¨?????????????????§????????????????????´?????????
?°???°?????\??????????????¨????????????????¨????????????¨????????????
???Input
??\???????????°????????????????????????????§???????????????????????????????????????????????????¢????????\????????¨????????§??????
 a op b
op ??? '?' ?????¨??? ??\?????????????????????????????????????????±???????????????????????£????????????????????????
???Output
?????????????????????????????????????¨??????????????????????????????????????????????
'''
# import
import sys

# ?????°??????????????????
for inputData in sys.stdin:
    inputList = inputData.split()
    a, op, b = int(inputList[0]), inputList[1], int(inputList[2])
    retVal = 0

    # 0?????´??? ????????????
    if op == '?':
        # exec end
        break
    elif op == '+':
        retVal = a + b
    elif op == '-':
        retVal = a - b
    elif op == '*':
        retVal = a * b
    elif op == '/':
        retVal = a // b
    else:
        retVal = 0

    # ????????????
    print(retVal)