n, k = map(int, input().split())
l = [*map(int, input().split())]
cnt = 0
for i in range(n):
idx = 0
for j in range(0, n-i):
if(l[j] > l[idx]):
idx = j
if idx == n - i - 1:
continue
l[idx], l[n - i - 1] = l[n - i - 1], l[idx]
cnt += 1
if k == cnt:
print(l[idx], l[n - i - 1])
break
else:
print(-1)