m=[[0,0,0],[0,0,0],[0,0,0]]
soma1=0
for novo1 in m[0]:
    soma1+=novo1
soma2=0
for novo2 in m[1]:
    soma2+=novo2
soma3=0
for novo3 in m[2]:
    soma3+=novo3

if soma1==0 and soma2==0 and soma3==0:
    print('nulo')
else:
    print('nao nulo')