xopy = input("xopy -> ")

if xopy.find('+') > -1:
    xy = xopy.split('+')
    print (int(xy[0]) - int(xy [1]))
elif xopy.find('-') > -1:
    xy = xopy.split('-')
    print (int(xy[0]) + int(xy [1]))
else:
    print ("NG")