# -*- coding: utf-8 -*-

import sys
from collections import Counter

def input(): return sys.stdin.readline().strip()
def list2d(a, b, c): return [[c] * b for i in range(a)]
def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)]
def list4d(a, b, c, d, e): return [[[[e] * d for j in range(c)] for j in range(b)] for i in range(a)]
def ceil(x, y=1): return int(-(-x // y))
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)]
def Yes(): print('Yes')
def No(): print('No')
def YES(): print('YES')
def NO(): print('NO')
INF = 10 ** 18
MOD = 10 ** 9 + 7

N, Q = MAP()
A = LIST()

C = sorted(Counter(A).items(), reverse=1)
out = []
for _ in range(Q):
    q = INT()

    ans = 0
    for k, v in C:
        cnt = min(q // k, v)
        q -= cnt * k
        ans += cnt
    
    if q > 0:
        out.append(str(-1))
    else:
        out.append(str(ans))
print('\n'.join(out))
