L1=[]
L2=[]
Mx=0
N,M=list(map(int,input().split()))
for i in range(N):
L1.append(list(map(int,input().split())))
for i in range(M):
L2.append(list(map(int,input().split())))
for i in range(N):
k = 0
for j in range(M):
D = (L1[i][0]-L2[j][0])**2 + (L1[i][1]-L2[j][1])**2
if D>k:
k=D
if k > Mx:
Mx= k
print(Mx)