What is the output of the following snippet of code?
```
P = [[1, 2], [4, 3]]
Q = [[4, 1], [9, 3]]
R = []
for i in range(2):
row = []
for j in range(2):
if P[i][j] - Q[i][j] > 0:
row.append(1)
elif P[i][j] == Q[i][j]:
row.append(0)
else:
row.append(-1)
R.append(row)
print(R)
```