r=True
while r:
  a = int(input("Input a: "))
  b = int(input("Input b: "))
  print("What to do?")
  print("1: to add")
  print("2; to sustract")
  print("3: to multiply")
  print("4: to divide")
  print("else: to quit")
  c = int(input("Input c: "))    
  if c==1:
    print (a,'+',b,'=',a+b)
  elif c==2:
    print (a,'-',b,'=',a-b)
  elif c==3:
    print (a,'*',b,'=',a*b)
  elif c==4:
    print (a,'/',b,'=',a/b)
  elif c==5:
    print("Quit")
    r=False