XAXB

 # XAXB

p = '1234'

for q in [ '1234','1235','4321','4231','5678']:

    ac = 0

    bc=0

    for i in range(4):

        if p[i]==q[i]:

            ac+=1

        elif p[i] in q:

            bc+=1

    print(f'{ac}A{bc}B')

runfile('C:/Users/j945935/.spyder-py3/untitled0.py', wdir='C:/Users/j945935/.spyder-py3')

4A0B

3A0B

0A4B

2A2B

0A0B