未知输入多少行的输入

import sys
for line in sys.stdin:
    l_0 = line.split()
    del l_0[0]
    l_1 = []
    l_0 = list(map(int, l_0))
    for i in l_0:
        if i % 2 == 1:
            l_1.append(i)
 
    a = sum(l_1) / len(l_1)
    print("{:.3f}".format(a))