def func1(a, b):
    ma = sum(a) / len(a)
    mb = sum(b) / len(b)
    
    da = sum((x - ma) ** 2 for x in a) / (len(a) - 1)
    db = sum((x - mb) ** 2 for x in b) / (len(b) - 1)
    
    ab = a + b
    maxv = max(ab)
    minv = min(ab)
    
    sps = [ma, mb, da, db, maxv, minv]
    return sps

def func2(x, a, b):
    mina = min(abs(z - x) for z in a)
    minb = min(abs(z - x) for z in b)
    
    if mina < minb:
        return 'A'
    else:
        return 'B'