I want to enter a function through input in python.

I would like to create a program that calculates the values of A, B, C, and D by receiving the values of A, B, C, and D as inputs and then entering a simple four-factor operation using A, B, C, and D in the variable F. However, if you enter a regular operation expression such as A+B/C-D as input, "A+B*C-D" is recognized as a string, and even if you substitute this value later, you just output the string. Attempting to convert the data type of variable F through int results in an error stating that A to D is not defined. The code I wrote is as follows.

1) A=input() B=input() C=input() D=input() Enter F=input('A~D' operation>>') A=int(A) B=int(B) C=int(C) D=int(D)

def calculation(A,B,C,D): print (F)

calculation(A,B,C,D) c=input()

**After running) If A, B, C, D enter 1, 2, 3, 4 and A+B+C+D in F, the resulting value is a string of A+B+C+D. When F=int(F) is added, the following error occurs during execution.

================== RESTART: C:\Users\msshi\Desktop\test.py ==================a 1 2 3 4 Please enter the operation using A~D>>A+B+C+D Traceback (most recent call last): File "C:\Users\msshi\Desktop\test.py", line 10, in F=int(F) ValueError: invalid literal for int() with base 10: 'A+B+C+D'

How can I create a program where I put random numbers in A, B, C, D and put various four-way operations such as A+B-C/D or (A-B)/C+D in F values, and calculate them according to A, B, C, and D?