s = ['sdf', 'avrb', 'yoljur', 'abdghf', 'yuegvx']
s1 = []
s2 = []
l = len(s)
s.sort()
for k in range (l):
    k = s.pop()
    if ()=='f':
        s1.append(k)
    else:
        s2.append(k)

s = ['sdf', 'asdghf', 'abdghf', 'avrb', 'yuegvx']

s = ['sdf', 'avrb', 'yoljur', 'abdghf', 'yuegvx', 'asdsa', 'mgfh']
s1, s2 = [], []
for i in sorted(s):
    if i.count('f'):
        s1.append(i)
    else:
        s2.append(i)
print s1 + s2

print(sorted(filter(lambda x: "f" in x, s)) + sorted(filter(lambda x: "f" not in x, s)))

from itertools import ifilter
print(sorted(ifilter(lambda x: "f" in x, s)) + sorted(ifilter(lambda x: "f" not in x, s)))

s = ['sdf', 'avrb', 'yoljur', 'abdghf', 'yuegvx']
s.sort(key=lambda x: (not 'f' in x, x))
print(s)