a = [ 2, 3, 2, 5, 4, 3, 7, 6, 4, 8, 6 ]
found = [ 0, 0, 0 ]

for i in a:
    if i >= found[0]:
        found[2] = found[1]
        found[1] = found[0]
        found[0] = i
    elif i >= found[1]:
        found[2] = found[1]
        found[1] = i
    elif i >= found[2]:
        found[2] = i

print found[2]