883 B | 883 chars
while True:
try:
N,M = map(int,input().split())
L = [list(map(int,input().split())) for i in range(N)]
except:
break
ans = 100
pos = [0,0]
ret = set()
for i in range(N-M+1):
for j in range(N-M+1):
S = set()
for ii in range(i,i+M):
for jj in range(j,j+M):
S.add(L[ii][jj])
if ans > len(S):
ans = len(S)
pos = [i,j]
ret = S
elif ans == len(S):
r1 = sorted(list(ret))
r2 = sorted(list(S))
for k in range(ans):
if r1[k] > r2[k]:
break
elif r1[k] < r2[k]:
pos = [i,j]
ret = S
break
print(pos[0]+1,pos[1]+1)