Task 10 (fnc)

with open('24-j2.txt') as f:
    a = f.readline()
    a = a.replace('F', '1').replace('A', '2').replace('I', '3').replace('L', '4')\
        .replace('12', '1 2').replace('21', '2 1') \
        .replace('13', '1 3').replace('31', '3 1')\
        .replace('14', '1 4').replace('41', '4 1')\
        .replace('23', '2 3').replace('32', '3 2') \
        .replace('24', '2 4').replace('42', '4 2') \
        .replace('34', '3 4').replace('43', '4 3')
print(max(map(len, a.split())))