i want to limit the user input as fixed length.and then i have to multiply with given input.i want c value as an integer.how do i get this? : def F_to_C():
    F=int(input("enter the F value:"))
    
    def F_to_C():
        F=int(input("enter the F value:"))  
        if len(F) >3:
            print("input is too long")
        else:
            C=(F-32)*(5/9)
            print("the corresponding celcius value is: ",C)



if len(F)>3:
TypeError: object of type 'int' has no len()
