a = float(input('a = '))
c = input()
b = float(input('b = '))
if c == "-" :
print (a-b)
elif c == "/" :
if c != "0" :
print (a/b)
else :
print("Деление на ноль!")
elif c == "*":
print(a*b)
elif c == "mod":
print (a % b)
elif c == "pow":
print(a ** b)
elif c == "div":
print(a // b)
elif c == "+":
print(a+b)
все '/' ето 1 пробел
